Symptom
The result of the network scheduling is not clear.
The system does not display the capacity requirements calculated by scheduling correctly.
Other Terms
CN21, CN22, CN24, network, scheduling, check list, scheduling of overall network, capacity
requirements, basic date, activity date, shift, relationship, night shift
Reason and Prerequisites
Solution
Check your settings according to the questions listed below:
Check list
* Note the following general rules
Networks are generally scheduled both forwards and backwards. The scheduling type defines which
scheduling direction the system takes into account first.
The dates of the earliest dates result from forward scheduling. The dates of the latest dates result
from backward scheduling.
* Which set of dates is used for scheduling?
Check which set of dates is selected.
* Which results cannot be explained?
1. Basic dates/forecast dates
2. Activity dates
3. Capacity requirements
1. Basic dates/forecast dates
* Do the basic dates change?
Check whether the alternative 'Adjust basic dates' has been chosen for the scheduling parameters. In
this case, the subsequent backward scheduling is executed from the scheduled finish date for
scheduling type forward. In the case of scheduling type backward, the system schedules from the
scheduled start date or if a "today" scheduling is to be executed, it schedules from the current
date.
If indicator 'Adjust basic dates' is not set, forward and backward scheduling is executed from the
entered basic dates. If no basic date is specified, the respective scheduling is executed from the
scheduled date.
Check whether the basic dates are set correctly on the basis of the activity dates.
* Is it possible to explain the basic dates on the basis of the activity dates?
1. Yes: The problem is caused by the activity dates. Proceed with the questions listed under "2.
Activity dates".
2. No: Continue.
* Has a "today" scheduling been executed?
Check the scheduling log for this.
Note that the forward scheduling is automatically overridden by a "today" scheduling as soon as the
order start date lies further in the past than the number of days defined in Customizing. In the
network, you can also maintain online the number of the days allowed in the past.If no order start date is defined, a "today" scheduling is executed provided the scheduled start
date lies too far in the past.
* Are activities already finally confirmed?
Basic dates are only adjusted allowing for the dates of not yet finally confirmed activities.
The system does not redetermine any dates for finally confirmed activities but copies the actual
dates to the activity dates.
* Are night shifts assigned to the last activities relevant to scheduling?Yes: Note that for backward scheduling the finish date is the end of the night shift of the previous
day so that, in this respect, the order finish date can be moved by one day. As a result, the
production dates can fall on a day that is a day off according to the factory calendar.
2. Activity dates
* Are the durations of the activity segments correct?
1. No: Go to point 2.1 'The durations of the activities are not correct'.
2. Yes: Go to point 2.2 'The durations of the activities are correct. However, the individual dates
cannot be explained.'
2.1. The durations of the activities are not correct
* Check both the formula for calculating duration in the work center and the standard
values used in the order.
l Which variables are used for the formulas?
l How is the result calculated?
l Using Transaction CR04, try to reproduce the problem for the operation stored in the work
center. With this transaction, you can test the scheduling formulas of the work center. To do
this, enter both the general operation values and the standard values and execute scheduling
(F5).
* Are the activities already finally confirmed?
Finally confirmed activities are no longer scheduled. The actual dates are copied to the activity
dates. The durations are calculated from the actual dates.
* Are activities already partially confirmed?
For partially confirmed activities, the remaining duration is scheduled during forwards scheduling
after the confirmed actual dates. The earliest start date is calculated from the confirmed actual
start date. The earliest finish date is the same as the actual start date plus the forecasted
processing time. If when you confirm, you have maintained a finish date for the forecast, scheduling
adopts the finish date for the forecast for the earliest finish date. If there is neither a
forecasted duration nor a forecasted finish date, the system then takes the planned duration
(benchmark) as a starting point and adds it to the actual start date.
The latest dates are not adjusted to the 'actual' situation. The activities - from the start date of
the successors - are scheduled backwards with the remaining duration - for the latest start and
finish date , so that the buffers can be calculated for the activity.
Exception: If indicator 'Shift order' is activated, the earliest dates are only scheduled with the
remining duration, the actual dates of the partially confirmed activities are not taken into
account.
* Are the activities relevant to scheduling?
For this check the activity control keys.
Note that for activities not relevant for scheduling, the system does not check whether the activity
falls on a day off since the activity can always be executed directly before or after another
activity. The duration of activities not relevant to scheduling is 0.
* Is the activity replaced by a subnetwork?
If according to the control key the activity is not relevant to scheduling, the activitiy is
replaced by the subnetwork when an overall network is scheduled so that the duration of the
subnetwork is copied to the activity.
If the activitiy is relevant to scheduling, the duration of the subnetwork is not copied to the
activity duration.
* Is it an externally processed activity?
If the activity is defined as an externally processed activity, the system displays the planned
delivery time as processing time and takes it into account. The activity is scheduled with the
planned delivery time according to the Gregorian calendar.
Note that activities with the 'Internally processed operation /external processing possible'
characteristic stored in the relevant control key are not interpreted as externally processed
activities.
* Is it an activity element?
The activity element dates are calculated on the basis of their earliest/latest dates for the
activity; in this case, the stored offsets are evaluated for the start and end. The duration defined
by the found dates is stored.
* Can the activity be extended?
Yes: The activity is extended according to the duration of the free float.
* Are the floats of the activity correct?
Check the floats using the dates of predecessors and successors.
* Has a reduction been executed during scheduling?
Check the scheduling log or the 'Reduction' field in the order header screen.
l Yes: Check the reduction parameters of scheduling and the scheduling log.
Check whether the duration of the in-house production has been calculated correctly
according to the reduction.
Check whether the duration falls short of the minimum duration of the activity. This
might be caused by the reduction. In this case, the duration is set to the minimum duration.
2.2. The durations of the activities are correct, however, the individual dates cannot be
explained.
In general, activities and relationships are scheduled using the operating time of a stored work
center. If no work center is stored but a factory calendar, it is scheduled to the day using the
factory calendar. If neither work center nor factory calendar are stored, it is scheduled according
to the Gregorian calendar.
* Have relationships been maintained?
Here note the time-dependent relationship representation in the network structure overview if
necessary.
l To which category does the relationship belong? Which activity is the predecessor, which one is
the successor?
l Has a duration of the relationship been maintained?
l Do external relationships exist for activities of other networks?
In this case, the system takes the dates of the external activities as restriction dates
into account. Here, the external network is not scheduled unless you started scheduling of the
overall network.
* Is the activity dispatched?
Check the status of the activity, and if necessary, the dispatching dates.* Have restriction dates been maintained for the activity?Check the type of the restriction dates and check whether the activity dates are correct on account
of the restrictions. Note that the restriction dates must always be taken into account unless the
activity is dispatched or finally confirmed.
* Is the activity assigned to a WBS element?For this, check the assignments of the activities (for example, on the general overview of
activities).
The dates of the WBS element are adhered to if the element is determining the dates, that is, if
indicator 'Network scheduling' is not activated in the WBS element. If indicator 'Network
scheduling' is activated in the WBS element so that the network determines the dates, the system
does not take the WBS dates into account.
If the operation is dispatched or if finally confirmed or restriction dates have been maintained,
this is not valid.
* Does the time unit of the activity or the relationship corresponds to the unit day or is
it even larger?
1. Yes: Go to point 2.2.1.
2. No: Go to point 2.2.2.
2.2.1. The time unit is larger or or equal to day
2.2.1.1. A work center is stored for the activity or relationship.
Note that the dates determines are moved to the next respective productive date, allowing for the
capacity at the work center.
* Does an active version of the available capacity exist?
* Yes: Scheduling is executed to the day using the days on which shifts are defined. If no operating time is maintained for the specified period, the system schedules
according to the Gregorian calendar.
*No: Continue.
* Has a factory calendar been stored in the work center?
l Yes: Scheduling is executed to the day using the workdays of the factory calendar.
l No: Scheduling is executed using the Gregorian calendar.
2.2.1.2. No work center but a factory calendar is stored for the activity or relationshipScheduling is executed to the day using the workdays of the factory calendar
2.2.1.3. For the activity or relationship, neither a work center nor a factory calendar is
stored
Scheduling is executed according to the Gregorian calendar.
2.2.2. The unit of the activity segment is smaller than day
2.2.2.1. For the activity or relationship, a work center is stored
* Does an active version of the available capacity exist?
l Yes: Has a shift sequence been stored?
¡ No: It is scheduled using the shifts stored in the interval of available capacity; in this
case the planned breaks are distributed equally over the entire shift duration.
¡ Yes: Check whether work break schedules are stored in the shift definitions of the shift
sequence and whether the 'Scheduling allowing for breaks' indicator is activated in
Customizing of the scheduling parameters.
If work break schedules are stored in the shift definitions of the shift
sequence and the 'Scheduling allowing for breaks' indicator is activated, the system schedules using
shifts stored in the interval of available capacity, while in doing so the breaks are taken
permanently into account.
If this is not the case, the system schedules using the shifts stored in the
interval of available capacity, while in doing so the planned breaks are distributed equally over
the entire shift duration.
* No: Has a standard available capacity been stored?
¡ No: It is scheduled according to the Gregorian calendar.
¡ Yes: If a factory calendar is stored, scheduling is executed using the standard available
capacity and the workdays of the factory calendar, while in doing so the breaks are
distributed equally over the entire shift duration.
If no factory calendar is stored, scheduling is executed using the standard
available capacity and the workdays of the plant calendar, while in doing so the breaks are
distributed equally over the entire shift duration.
The problem exists also when these rules are taken into account
Before you enter a customer message, try to reproduce the problem for the activity stored
in the work center using Transaction CR04. With this transaction, you can simulate scheduling using
a work center. For this purpose, you can on the one hand, specify the start or end of the productive
time as well as a duration so that the missing date is determined with regard to the shifts of the
work center. On the other hand, with regard to the shifts, the productive time between the dates can
be calculated by specifying the two dates and an initial duration. Start for the two simulation
types the determination of productive time (F8) and take the 'Breaks' indicator into account for
scheduling allowing for breaks.
2.2.2.2. No work center but a factory calendar is stored for the activity or relationship.Scheduling is executed using the workdays of the factory calendar
2.2.2.3. For the activity or relationship, neither a work center nor a factory calendar is
stored
Scheduling is executed using the plant calendar
3. Capacity requirements
Capacity requirements are calculated during scheduling. The dates of the respective operations are
copied to the dates of the capacity requirements. Changes relevant to scheduling (for example,
changes to the lot size) are only copied to capacity requirements after another scheduling.
In the network, check the procedure detail screen 'Person assignment' in order to check whether
capacity requirements have been generated for this activity. You can receive a detailed display and
an evaluation of the capacity data in the capacity requirements planning. You can branch directly
from the network to graphical capacity requirements planning.
3.1. The system displays capacity requirements for a capacity category.
* Is the amount of the capacity requirements correct ?
Yes: The result is correct
l No: Check the following points:
¡ Check the work for the activity and the formula for the capacity categories for the work
center.
¡ If necessary, test the formula at the work center with the work you maintained for the
activity.
* Does the system display capacity requirements for all relevant capacity categories?
l Yes: The result is correct
l No: Check the capacity categories exsiting for the work center
3.2. Detail screen 'Person assignment' does not exist although capacity requirements ought
to be calculated
* Have you set the 'Capacity requirements' indicator in the 'Scheduling' header screen of
the network?
l No: Set this indicator and schedule again. If still no capacity requirements exist afterwards,
continue. The 'Capacity requirements' indicator is copied from the settings of the Scheduling
Customizing to the network header. If you basically want to have capacity requirements
calculated, change your Customizing correspondingly.
l Yes: Check the following points:
¡ Check the work entered for the activity.
¡ Check the formula used for capacity category at the work center and test the formula at the
work center with the value of the work used for the activity if necessary.
¡ Check the control key used. If the control key of activity does not support any capacity
requirements planning, the system does not calculate any capacity requirements.
¡ Check the status of the activity. Is the activity partially or finally confirmed? Finally
confirmed activities have no longer any capacity requirements.
3.3. The system displays capacity requirements although no capacity requirements ought to
be calculated
You can deactivate the capacity requirements planning in different ways. If you want the system to
calculate no capacity requirements for the entire network, deactivate the 'Capacity requirements'
field in the header of the network. If you want the system to calculate never any capacity
requirements, change your Customizing correspondingly so that the 'Capacity requirements' indicator
is always inactive.
If you only want the system to calculate no capacity requirements for individual activities, choose
a corresponding control key for this activity or use a work center without capacity categories.
4. The result can also not be explained after the stated points have been checked
Before you enter a customer problem message:
l Search for notes in the Online Service System
Search for notes of your release for the components PP-CRP-SCH (scheduling) and PS-DAT-
NET (network scheduling). Do not mention key word 'scheduling' because this key word is already
sufficiently defined by the component allocation. For the search, use additional key words which
characterize your problem or which characterize the data to be scheduled in more detail, for
example: Basic dates, activity dates, night shift, scheduling of overall network ...
l If you cannot find a note that solves your problem, create a customer problem message for the
PP-CRP-SCH or PS-DAT-NET component. Answer the following questions in your problem description:
1. What does your problem look like?
For this, restrict your problem as far as possible with this check list.
2. Where and when does your problem occur or can the problem be reprocessed?
¡ If possible, make example data available and describe how your problem can be reprocessed.
¡ If your problem can be restricted to the scheduling of one activity, try to reproduce the
problem for the work center stored in the activity using Transaction CR04.
With this transaction, you can simulate scheduling using a work center. For this
purpose, you can on the one hand specify the start or end of the productive time as well as a
duration so that the missing date is determined with regard to the shifts of the work center. On the
other hand, with regard to the shifts, the productive time between the dates can be calculated by
specifying the two dates and an initial duration. Start for the two simulation types the
determinatin of productive time (F8) and take the 'Breaks' indicator into account for scheduling
allowing for breaks.
Furthermore, you can test the scheduling formulas of the work center with this
transaction. For this enter the general activity values as well as the standard values and execute
scheduling (F5).
In the same way as for scheduling formulas you can test the formulas which are
the basis for the capacity requirement calculation (F6) and costing (F7).
3. What other determining factors exist ?
For example, Customizing parameters scheduling type, relationships.
The result of the network scheduling is not clear.
The system does not display the capacity requirements calculated by scheduling correctly.
Other Terms
CN21, CN22, CN24, network, scheduling, check list, scheduling of overall network, capacity
requirements, basic date, activity date, shift, relationship, night shift
Reason and Prerequisites
Solution
Check your settings according to the questions listed below:
Check list
* Note the following general rules
Networks are generally scheduled both forwards and backwards. The scheduling type defines which
scheduling direction the system takes into account first.
The dates of the earliest dates result from forward scheduling. The dates of the latest dates result
from backward scheduling.
* Which set of dates is used for scheduling?
Check which set of dates is selected.
* Which results cannot be explained?
1. Basic dates/forecast dates
2. Activity dates
3. Capacity requirements
1. Basic dates/forecast dates
* Do the basic dates change?
Check whether the alternative 'Adjust basic dates' has been chosen for the scheduling parameters. In
this case, the subsequent backward scheduling is executed from the scheduled finish date for
scheduling type forward. In the case of scheduling type backward, the system schedules from the
scheduled start date or if a "today" scheduling is to be executed, it schedules from the current
date.
If indicator 'Adjust basic dates' is not set, forward and backward scheduling is executed from the
entered basic dates. If no basic date is specified, the respective scheduling is executed from the
scheduled date.
Check whether the basic dates are set correctly on the basis of the activity dates.
* Is it possible to explain the basic dates on the basis of the activity dates?
1. Yes: The problem is caused by the activity dates. Proceed with the questions listed under "2.
Activity dates".
2. No: Continue.
* Has a "today" scheduling been executed?
Check the scheduling log for this.
Note that the forward scheduling is automatically overridden by a "today" scheduling as soon as the
order start date lies further in the past than the number of days defined in Customizing. In the
network, you can also maintain online the number of the days allowed in the past.If no order start date is defined, a "today" scheduling is executed provided the scheduled start
date lies too far in the past.
* Are activities already finally confirmed?
Basic dates are only adjusted allowing for the dates of not yet finally confirmed activities.
The system does not redetermine any dates for finally confirmed activities but copies the actual
dates to the activity dates.
* Are night shifts assigned to the last activities relevant to scheduling?Yes: Note that for backward scheduling the finish date is the end of the night shift of the previous
day so that, in this respect, the order finish date can be moved by one day. As a result, the
production dates can fall on a day that is a day off according to the factory calendar.
2. Activity dates
* Are the durations of the activity segments correct?
1. No: Go to point 2.1 'The durations of the activities are not correct'.
2. Yes: Go to point 2.2 'The durations of the activities are correct. However, the individual dates
cannot be explained.'
2.1. The durations of the activities are not correct
* Check both the formula for calculating duration in the work center and the standard
values used in the order.
l Which variables are used for the formulas?
l How is the result calculated?
l Using Transaction CR04, try to reproduce the problem for the operation stored in the work
center. With this transaction, you can test the scheduling formulas of the work center. To do
this, enter both the general operation values and the standard values and execute scheduling
(F5).
* Are the activities already finally confirmed?
Finally confirmed activities are no longer scheduled. The actual dates are copied to the activity
dates. The durations are calculated from the actual dates.
* Are activities already partially confirmed?
For partially confirmed activities, the remaining duration is scheduled during forwards scheduling
after the confirmed actual dates. The earliest start date is calculated from the confirmed actual
start date. The earliest finish date is the same as the actual start date plus the forecasted
processing time. If when you confirm, you have maintained a finish date for the forecast, scheduling
adopts the finish date for the forecast for the earliest finish date. If there is neither a
forecasted duration nor a forecasted finish date, the system then takes the planned duration
(benchmark) as a starting point and adds it to the actual start date.
The latest dates are not adjusted to the 'actual' situation. The activities - from the start date of
the successors - are scheduled backwards with the remaining duration - for the latest start and
finish date , so that the buffers can be calculated for the activity.
Exception: If indicator 'Shift order' is activated, the earliest dates are only scheduled with the
remining duration, the actual dates of the partially confirmed activities are not taken into
account.
* Are the activities relevant to scheduling?
For this check the activity control keys.
Note that for activities not relevant for scheduling, the system does not check whether the activity
falls on a day off since the activity can always be executed directly before or after another
activity. The duration of activities not relevant to scheduling is 0.
* Is the activity replaced by a subnetwork?
If according to the control key the activity is not relevant to scheduling, the activitiy is
replaced by the subnetwork when an overall network is scheduled so that the duration of the
subnetwork is copied to the activity.
If the activitiy is relevant to scheduling, the duration of the subnetwork is not copied to the
activity duration.
* Is it an externally processed activity?
If the activity is defined as an externally processed activity, the system displays the planned
delivery time as processing time and takes it into account. The activity is scheduled with the
planned delivery time according to the Gregorian calendar.
Note that activities with the 'Internally processed operation /external processing possible'
characteristic stored in the relevant control key are not interpreted as externally processed
activities.
* Is it an activity element?
The activity element dates are calculated on the basis of their earliest/latest dates for the
activity; in this case, the stored offsets are evaluated for the start and end. The duration defined
by the found dates is stored.
* Can the activity be extended?
Yes: The activity is extended according to the duration of the free float.
* Are the floats of the activity correct?
Check the floats using the dates of predecessors and successors.
* Has a reduction been executed during scheduling?
Check the scheduling log or the 'Reduction' field in the order header screen.
l Yes: Check the reduction parameters of scheduling and the scheduling log.
Check whether the duration of the in-house production has been calculated correctly
according to the reduction.
Check whether the duration falls short of the minimum duration of the activity. This
might be caused by the reduction. In this case, the duration is set to the minimum duration.
2.2. The durations of the activities are correct, however, the individual dates cannot be
explained.
In general, activities and relationships are scheduled using the operating time of a stored work
center. If no work center is stored but a factory calendar, it is scheduled to the day using the
factory calendar. If neither work center nor factory calendar are stored, it is scheduled according
to the Gregorian calendar.
* Have relationships been maintained?
Here note the time-dependent relationship representation in the network structure overview if
necessary.
l To which category does the relationship belong? Which activity is the predecessor, which one is
the successor?
l Has a duration of the relationship been maintained?
l Do external relationships exist for activities of other networks?
In this case, the system takes the dates of the external activities as restriction dates
into account. Here, the external network is not scheduled unless you started scheduling of the
overall network.
* Is the activity dispatched?
Check the status of the activity, and if necessary, the dispatching dates.* Have restriction dates been maintained for the activity?Check the type of the restriction dates and check whether the activity dates are correct on account
of the restrictions. Note that the restriction dates must always be taken into account unless the
activity is dispatched or finally confirmed.
* Is the activity assigned to a WBS element?For this, check the assignments of the activities (for example, on the general overview of
activities).
The dates of the WBS element are adhered to if the element is determining the dates, that is, if
indicator 'Network scheduling' is not activated in the WBS element. If indicator 'Network
scheduling' is activated in the WBS element so that the network determines the dates, the system
does not take the WBS dates into account.
If the operation is dispatched or if finally confirmed or restriction dates have been maintained,
this is not valid.
* Does the time unit of the activity or the relationship corresponds to the unit day or is
it even larger?
1. Yes: Go to point 2.2.1.
2. No: Go to point 2.2.2.
2.2.1. The time unit is larger or or equal to day
2.2.1.1. A work center is stored for the activity or relationship.
Note that the dates determines are moved to the next respective productive date, allowing for the
capacity at the work center.
* Does an active version of the available capacity exist?
* Yes: Scheduling is executed to the day using the days on which shifts are defined. If no operating time is maintained for the specified period, the system schedules
according to the Gregorian calendar.
*No: Continue.
* Has a factory calendar been stored in the work center?
l Yes: Scheduling is executed to the day using the workdays of the factory calendar.
l No: Scheduling is executed using the Gregorian calendar.
2.2.1.2. No work center but a factory calendar is stored for the activity or relationshipScheduling is executed to the day using the workdays of the factory calendar
2.2.1.3. For the activity or relationship, neither a work center nor a factory calendar is
stored
Scheduling is executed according to the Gregorian calendar.
2.2.2. The unit of the activity segment is smaller than day
2.2.2.1. For the activity or relationship, a work center is stored
* Does an active version of the available capacity exist?
l Yes: Has a shift sequence been stored?
¡ No: It is scheduled using the shifts stored in the interval of available capacity; in this
case the planned breaks are distributed equally over the entire shift duration.
¡ Yes: Check whether work break schedules are stored in the shift definitions of the shift
sequence and whether the 'Scheduling allowing for breaks' indicator is activated in
Customizing of the scheduling parameters.
If work break schedules are stored in the shift definitions of the shift
sequence and the 'Scheduling allowing for breaks' indicator is activated, the system schedules using
shifts stored in the interval of available capacity, while in doing so the breaks are taken
permanently into account.
If this is not the case, the system schedules using the shifts stored in the
interval of available capacity, while in doing so the planned breaks are distributed equally over
the entire shift duration.
* No: Has a standard available capacity been stored?
¡ No: It is scheduled according to the Gregorian calendar.
¡ Yes: If a factory calendar is stored, scheduling is executed using the standard available
capacity and the workdays of the factory calendar, while in doing so the breaks are
distributed equally over the entire shift duration.
If no factory calendar is stored, scheduling is executed using the standard
available capacity and the workdays of the plant calendar, while in doing so the breaks are
distributed equally over the entire shift duration.
The problem exists also when these rules are taken into account
Before you enter a customer message, try to reproduce the problem for the activity stored
in the work center using Transaction CR04. With this transaction, you can simulate scheduling using
a work center. For this purpose, you can on the one hand, specify the start or end of the productive
time as well as a duration so that the missing date is determined with regard to the shifts of the
work center. On the other hand, with regard to the shifts, the productive time between the dates can
be calculated by specifying the two dates and an initial duration. Start for the two simulation
types the determination of productive time (F8) and take the 'Breaks' indicator into account for
scheduling allowing for breaks.
2.2.2.2. No work center but a factory calendar is stored for the activity or relationship.Scheduling is executed using the workdays of the factory calendar
2.2.2.3. For the activity or relationship, neither a work center nor a factory calendar is
stored
Scheduling is executed using the plant calendar
3. Capacity requirements
Capacity requirements are calculated during scheduling. The dates of the respective operations are
copied to the dates of the capacity requirements. Changes relevant to scheduling (for example,
changes to the lot size) are only copied to capacity requirements after another scheduling.
In the network, check the procedure detail screen 'Person assignment' in order to check whether
capacity requirements have been generated for this activity. You can receive a detailed display and
an evaluation of the capacity data in the capacity requirements planning. You can branch directly
from the network to graphical capacity requirements planning.
3.1. The system displays capacity requirements for a capacity category.
* Is the amount of the capacity requirements correct ?
Yes: The result is correct
l No: Check the following points:
¡ Check the work for the activity and the formula for the capacity categories for the work
center.
¡ If necessary, test the formula at the work center with the work you maintained for the
activity.
* Does the system display capacity requirements for all relevant capacity categories?
l Yes: The result is correct
l No: Check the capacity categories exsiting for the work center
3.2. Detail screen 'Person assignment' does not exist although capacity requirements ought
to be calculated
* Have you set the 'Capacity requirements' indicator in the 'Scheduling' header screen of
the network?
l No: Set this indicator and schedule again. If still no capacity requirements exist afterwards,
continue. The 'Capacity requirements' indicator is copied from the settings of the Scheduling
Customizing to the network header. If you basically want to have capacity requirements
calculated, change your Customizing correspondingly.
l Yes: Check the following points:
¡ Check the work entered for the activity.
¡ Check the formula used for capacity category at the work center and test the formula at the
work center with the value of the work used for the activity if necessary.
¡ Check the control key used. If the control key of activity does not support any capacity
requirements planning, the system does not calculate any capacity requirements.
¡ Check the status of the activity. Is the activity partially or finally confirmed? Finally
confirmed activities have no longer any capacity requirements.
3.3. The system displays capacity requirements although no capacity requirements ought to
be calculated
You can deactivate the capacity requirements planning in different ways. If you want the system to
calculate no capacity requirements for the entire network, deactivate the 'Capacity requirements'
field in the header of the network. If you want the system to calculate never any capacity
requirements, change your Customizing correspondingly so that the 'Capacity requirements' indicator
is always inactive.
If you only want the system to calculate no capacity requirements for individual activities, choose
a corresponding control key for this activity or use a work center without capacity categories.
4. The result can also not be explained after the stated points have been checked
Before you enter a customer problem message:
l Search for notes in the Online Service System
Search for notes of your release for the components PP-CRP-SCH (scheduling) and PS-DAT-
NET (network scheduling). Do not mention key word 'scheduling' because this key word is already
sufficiently defined by the component allocation. For the search, use additional key words which
characterize your problem or which characterize the data to be scheduled in more detail, for
example: Basic dates, activity dates, night shift, scheduling of overall network ...
l If you cannot find a note that solves your problem, create a customer problem message for the
PP-CRP-SCH or PS-DAT-NET component. Answer the following questions in your problem description:
1. What does your problem look like?
For this, restrict your problem as far as possible with this check list.
2. Where and when does your problem occur or can the problem be reprocessed?
¡ If possible, make example data available and describe how your problem can be reprocessed.
¡ If your problem can be restricted to the scheduling of one activity, try to reproduce the
problem for the work center stored in the activity using Transaction CR04.
With this transaction, you can simulate scheduling using a work center. For this
purpose, you can on the one hand specify the start or end of the productive time as well as a
duration so that the missing date is determined with regard to the shifts of the work center. On the
other hand, with regard to the shifts, the productive time between the dates can be calculated by
specifying the two dates and an initial duration. Start for the two simulation types the
determinatin of productive time (F8) and take the 'Breaks' indicator into account for scheduling
allowing for breaks.
Furthermore, you can test the scheduling formulas of the work center with this
transaction. For this enter the general activity values as well as the standard values and execute
scheduling (F5).
In the same way as for scheduling formulas you can test the formulas which are
the basis for the capacity requirement calculation (F6) and costing (F7).
3. What other determining factors exist ?
For example, Customizing parameters scheduling type, relationships.
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