If you have a little knowledge about output determination then you must know that the output is triggered because you or your colleagues have customized it. Without customizing and condition records nothing will be printed.
Further it is very questionable why changes to a purchase order should not be communicated to the vendor, if these are changes at fields which are not relevant for the vendor then we have customizing for print relevant changes.
The output of changes is a prerequisite for reminders and versioning, so you should not restrict it, you should customize it to the needs, this has nothing to do with ABAP development.
You can remove the output for Operation 2 (Change) in the setting for " Fine tuned message control"
SPRO-->MM-->Purchasing--> Messages-->Output Control-->Message Types-->Define message types for PO--> Fine tuned Control
Although , i agree with Jurgen, why would you not convey to the Vendor that you are changing the PO details? Is the PO not meant for the Vendor itself?
Thanks
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