Message type: E = Error
Message class:  USMD2 - Master Data: UI Modeling 
Message number: 159
Message text: You have finalized the processing of change request &1
Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.
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The SAP error message USMD2159 typically indicates that you are trying to process a change request that has already been finalized. This means that the change request has been completed and cannot be modified or processed further.
Cause: The error occurs when: You attempt to make changes to a change request that has already been finalized. The system is configured to prevent further processing of finalized change requests to maintain data integrity and consistency.
Solution: To resolve this error, you can consider the following options: Check the Status of the Change Request: Verify the status of the change request in the system. If it is finalized, you will not be able to make further changes. Create a New Change Request: If you need to make additional changes, you may need to create a new change request instead of trying to modify the finalized one. Reopen the Change Request (if applicable): In some cases, it may be possible to reopen a finalized change
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