When backflushing actual data and carrying out the goods movements involved in this process, the following may occur:
The backflushed components may not be available at the warehouse.
The storage location for which the backflush is to be posted is missing.
If such errors occur and you do not correct them immediately in dialog mode, the system creates backlogs when backflushing (also known as postprocessing records).
You must set the repetitive manufacturing profile so that postprocessing records are created.
Two options are available for creating postprocessing records:
Creating cumulated backlogs from the backflush
Here, the system collects all the backlogs that exist for one material in a collective document. This procedure has positive effects on performance.
The disadvantage of this procedure is that the backlog can only be postprocessed when the complete cumulated quantity has been posted to stock in the system. A further disadvantage is when reversing. The system cannot create a reference to the original backflush document and the individual missing quantities of each backflush. Therefore, postprocessing records are not adjusted when reversing. A further disadvantage of this procedure is that when postprocessing the backlogs, the system posts for the posting date and not for the actual date of the backlog.
Creating cumulated backlogs and individual records
Here, the system creates a collective document and another individual document per incorrect withdrawal posting with document items on the individual missing components. This individual document is also referenced in the full backflush document. Every individual document contains the date of the backflush. When postprocessing, the system creates a material document per date listing the postprocessing items for this date.
When postprocessing, the system sorts the individual documents according to the date. That is, you process the oldest document first. You can only postprocess a postprocessing record on the basis of this individual document if you can post the complete quantity in this individual record.
This procedure also provides a better solution for reversing. If you want to reverse a backflush, the system can now determine and delete the exact individual backflush document. This means you can avoid double postings. At the same time, the system adjusts the backlog quantity in the collective backflush document.
However, as far as performance is concerned, this procedure is slower than the above procedure without individual records.
Note
As an alternative to postprocessing backlogs, you can instruct the system to post negative stock quantities. To do this, you must allow posting to negative stocks in Customizing for Inventory Management and you must also set the appropriate indicator in the material master record, in the General plant data .