How To Fix GU927 - Use user exit & once only

SAP Error Message - Details

• Message type: E = Error

• Message class: GU - FI-SL utilities

• Message number: 927

• Message text: Use user exit & once only

What causes this issue?

Use can use a user exit once only for reasons of consistency.

How to fix this error?

Use different user exits.

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message GU927 - Use user exit & once only ?

  The SAP error message GU927 ("Use user exit & once only") typically occurs in the context of user exits in SAP, particularly when there is an attempt to use a user exit more than once in a single transaction or process. This error is often related to the configuration of user exits in the SAP system, which are custom enhancements that allow you to add your own business logic to standard SAP applications.
  Cause:
  
  Multiple Calls to User Exit: The error usually arises when a user exit is called multiple times within the same transaction or process. SAP expects certain user exits to be executed only once to maintain data integrity and avoid unexpected behavior.
  Incorrect Configuration: The user exit may not be configured correctly, leading to multiple invocations.
  Custom Code Issues: If there is custom code that inadvertently calls the user exit multiple times, this can trigger the error.
  
  Solution:
  
  Review User Exit Logic: Check the logic in the user exit to ensure it is designed to be called only once. You may need to implement checks to prevent multiple executions.
  Modify Custom Code: If you have custom code that calls the user exit, modify it to ensure that the user exit is only invoked once per transaction.
  Debugging: Use debugging tools in SAP to trace the execution flow and identify where the user exit is being called multiple times.
  Consult Documentation: Review SAP documentation or notes related to the specific user exit you are using to understand its intended use and any restrictions.
  Testing: After making changes, thoroughly test the transaction to ensure that the error no longer occurs and that the business logic behaves as expected.
  
  Related Information:
  
  User Exits: User exits are part of the SAP enhancement framework and allow developers to add custom code to standard SAP applications without modifying the original code.
  SAP Notes: Check SAP Notes for any known issues or updates related to the specific user exit you are working with.
  Transaction Codes: Familiarize yourself with transaction codes related to user exits, such as SMOD (for enhancements) and CMOD (for project management of enhancements).
  Performance Considerations: Be mindful of performance implications when modifying user exits, as inefficient code can lead to performance degradation.
  
  If the problem persists after following these steps, consider reaching out to SAP support or consulting with an experienced SAP developer for further assistance.