If you change a sales order for which a
multilevel ATP check
or a
CTP process
) has already been executed and then carry out a check again, the
ATP tree structures
or the procurement proposals that were created in
Production Planning and Detailed Scheduling
(PP/DS) from the ATP tree structures may be "obsolete".
This may cause problems, above all if the ATP tree structures for the sales order have already been converted into procurement proposals and you bring forward the desired date/time or increase the desired quantity. Since the ATP check checks against existing procurement proposals, the system cannot bring forward the confirmation date/time if you specify an earlier desired date/time for the simple reason that receipt elements - although late – exist. A quantity increase results in an order split.
If you use the
Recreate Procurement Proposals
function, the system ignores the original procurement proposals during the ATP check in the sales order and replaces them if necessary with new, more suitable procurement proposals after the sales order has been saved.
The recreation of receipts during a new ATP/CTP check as a result of a change to an existing sales order has the following advantages:
If the desired date/time is changed (brought forward, for example), the system creates a new receipt element in line with the desired date/time and is thus able to confirm the new date/time (provided there is enough free capacity). The superfluous receipt element is deleted.
If the desired quantity in the sales order is increased, the system creates a new receipt element amounting to the new order quantity. The superfluous receipt element is deleted.
You have set the
Recreate Receipt Elements
indicator in the check instructions in Customizing for the
Global ATP Check.
In the product master (on the
ATP
tab page) you have specified a
horizon
for the recreation of receipt elements.
In order that the new function can be used not only for make-to-order production but also in connection with make-to-stock production strategies , the following additional prerequisites must be satisfied in the case of make-to-stock production :
You must use fixed pegging in order to be able to fix the assignment of the receipt element to the customer requirement made by the ATP check. For this purpose, you must have selected the
Creation of Fixed Pegging-Relationships
option in the
Fix.
Pegging in CTP/ATP
field and entered the class /SAPAPO/CL_RRP_CTP in the
ABAP Class for CTP Processes
field in the
PP Planning Procedure
.
In order that the system can create a fixed pegging relationship between a receipt element and the assigned customer requirement, you must have selected the
Characteristic Evaluation
option in the
check mode
in the
Production Type
field.
The receipt element must be assigned to just one sales order item. You achieve this by previously having set
lot-for-lot
for the product to be checked.In this case, the system creates just one receipt element for the requirement and assigns this element to the pegged requirement.
The system behavior depends on whether an original ATP tree structure has already been converted into procurement proposals in PP/DS at the time of the renewed ATP check, as follows:
The original ATP tree structure has not yet been converted
Here, the original ATP tree structure still exists, and no procurement proposals have yet been created. In this case, the system replaces the original ATP structure with the new one when the changed sales order is saved.
The original ATP tree structure has already been converted
Here, the procurement proposals have already been created and the ATP tree structure no longer exists. In this case, the system creates adjustment records for the procurement proposals whose availability date is outside the
horizon for the recreation of receipts
(recreation horizon) that you have specified on the
ATP
tab page in the location product master. These procurement proposals are then no longer visible for the new check.
If you then save the changed sales order, the system:
Deletes the adjustment records
Creates a new ATP tree structure
Immediately deletes the procurement proposals belonging to the original ATP tree structure and whose availability date is outside the recreation horizon.
The deletion takes place irrespective of the status of the procurement proposals. However, the system can only delete the procurement proposals that have not yet been transferred to the SAP R/3 system.
If you do not save the changed sales order, the system deletes the adjustment records again and retains the original ATP tree structure or the original procurement proposals.
For more information, see Reactions to the Availability Check .
Restrictions
In the CTP process:
If the receipt elements are fixed (PP-fixed, input-fixed, or activity-fixed), the system can no longer delete them. The ATP check therefore takes into account the receipt elements that cannot be replaced by new ones.
In the case of a multilevel ATP check
If the indicator for multilevel ATP check has been set for the receipt element and you additionally set the conversion indicator, this order cannot be deleted but is taken into account by the ATP check.
In both cases:
As a general rule, you cannot use this new function if you are using the
Collaboration Via Scheduling Agreements
functionality.