3731312 - Assignment (ZUONR) field displays unexpected prefixes such as "X/" or "X/X/" in the Manage Customer Line Items app - SAP S/4HANA Cloud Public Edition

The Assignment (ZUONR) field in customer line items shows unexpected prefixes such as "X/" or "X/X/" instead of the expected format (e.g., "00" followed by billing document ID). 

1. Open Manage Customer Line Items app.
2. Add or view the Assignment field in line items.
3. Observe that the Assignment field contains prefixes like "X/" or "X/X/".

• Active custom logic implementations are influencing the population of the Assignment (ZUONR) field during journal entry creation.
• Specifically, custom logic under the Journal Entry Substitution (FIN_ACDOC_SUBSTITUTION) business context modifies the standard behavior and introduces additional prefixes.

The behavior is caused by active custom logic and is not part of standard system processing.

To analyze and adjust the behavior:

1. Navigate to the Custom Logic app.
2. Check implementations under the business context:
   • Journal Entry Substitution (FIN_ACDOC_SUBSTITUTION).
3. Identify any logic affecting the Assignment (ZUONR) field.
4. Modify or deactivate the relevant custom logic as required to achieve the expected format.

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