Date/Time Changes when Planning with Product Interchangeability
Use
During the planning process, the availability date/time of an in-house production order can change; for example, due to manual changes in interactive planning, due to PP/DS optimization, or due to detailed scheduling with DS heuristics. A change to the date or time has an effect on the dependent requirements of the in-house production order and thus also the substitutions planned for the order or already performed in the order. To adjust planning, you should execute an MRP planning run again after date/time changes or, in interactive planning, execute the product heuristic again.
Note
Orders within the PP/DS horizon are automatically fixed for the MRP planning run. This means that the results of sequencing are also fixed in this period. You use a suitable
reuse mode
(such as
Use Suitable Receipts
), if required, with a large reuse interval so that the planning run does not change planning outside the PP/DS horizon.
If an in-house production order already contains substitute components, you can update the dependent requirements after a date/time change by performing an ATP check for the order in SAP APO.
Features
Detailed Scheduling Strategies
In the detailed scheduling strategy, you can define that you want the system to take account of pegging relationships. If you use this strategy to reschedule a planned order to an earlier date/time, the system also reschedules the product substitution order to the new dependent requirements date/time. With this strategy, you can also prevent a dynamic pegging relationship between a dependent requirement and a product substitution order being lost if the new dependent requirements date/time varies too much from the availability date/time of the product substitution order.
Note
The prerequisite for the adoption of substitute components when the conversion indicator is set are pegging relationships.
If you have defined that you do not want the system to take account of pegging relationships when rescheduling, the system does not reschedule the product substitution order. As long as there is a pegging relationship between the dependent requirement and the product substitution order, the system is able to generate an alert for the date/time variance.
Validity Periods
To avoid restricting planning with too many constraints, you should plan in PP/DS optimization and in Detailed Scheduling without taking account of validity periods. Use relevant optimization profiles and strategies. Instead, define in the PP/DS alert profile that the system should create the alert
Order Outside its Validity Period
if the validity period is violated.
Examples of Planning Problems After Date/Time Changes
The following sections provide an overview of the possible effects of a date/time change:
The dependent requirements dates/times might change.
After the date/time change, the new dependent requirements date/time for an interchangeable component might be outside the validity period of the component, or the component could be valid on the new requirements date/time but not available.
Substitutions already contained in the order are lost.
This case is relevant if you change the availability date/time of an in-house production order in the order view (for example, in the product view). If the new availability date/time is outside the validity period of the order and the status of the order permits a reexplosion, the system can execute a reexplosion. The system does not take account of product interchangeability (InC) during the reexplosion. The system uses the original components again, in other words the components that are required in the in-house production source of supply (see also Interactive Change to the Receipt Quantity when Planning with Product Interchangeability ).
Product substitution orders are no longer up-to-date.
The system creates product substitution orders for a specific requirement, for a particular date/time, and with a specific quantity. The availability situation is different at a changed requirements date/time. This means that the product substitution order is no longer up-to-date, even if it was also rescheduled to the new date/time. In particular, the new availability date/time could be outside the validity period of the product substitution order.