3504410 - The "Assignment" field is filled in the Credit Memo Project Services although the assignment number is not maintained in the copying control settings

When checking the header level of the Credit Memo Project Services (billing type:CM01) , the "Assignment" field is filled although the assignment number is not maintained in the copying control settings.

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SAP S/4HANA Cloud Public Edition

1. Open the "Display Billing Documents" app.
2. Choose one Credit Memo Project Services (billing type:CM01).
3. Check the "Assignment" field in the header detail.
4. This field is filled with the preceding reference invoice number (billing type:CI01), although the assignment number is not maintained in the copying control settings from CI01 to CM01. 

When the document flow of this invoice is: Project Billing Document Request (type: PBDR)→ Invoice  (type: CI01) → Credit Memo Project Services (type: CM01), the assignment number in Credit Memo Project (type: CM01) is coming from the preceding invoice (type: CI01).

This is the standard system behavior.

header level, billing document, assignment, credit memo project services, billing type, CM01, CI01, copying control, PBDR , KBA , SD-BIL-IV-2CL , Processing Billing Documents (Public Cloud) , Problem