How To Fix DG311 - Change number &1 is already locked

SAP Error Message - Details

• Message type: E = Error

• Message class: DG - DG: Messages for Dangerous Goods Management

• Message number: 311

• Message text: Change number &1 is already locked

What causes this issue?

You want to create or process the change number &V1&. This means that
one of the following situations led to an error message:
The change master record is currently being created or processed by
another user.
The change master record was being processed, but the system has not
yet updated it.
Another user is changing the object with reference to the change number
&V1&.
Another user has flagged the object change with a revision status, with
regard to the change number &V1&.

How to fix this error?

Process the change number later, or find out the reason why the object
'ECAENRS' is locked by contacting the user responsible.
You can use transaction 'SM12' to determine which user is currently
locking the change number entered for theblocked object 'ECAENRS'.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message DG311 - Change number &1 is already locked ?

  The SAP error message DG311, which states "Change number &1 is already locked," typically occurs in the context of change management within SAP, particularly when dealing with change numbers in the Change Management module (often related to the Engineering Change Management (ECM) functionality).
  Cause:
  The error indicates that the change number you are trying to access or modify is currently locked by another user or process. This can happen for several reasons:
  
  Concurrent Access: Another user is currently editing or processing the same change number.
  Incomplete Transactions: A previous transaction involving the change number was not completed properly, leaving it in a locked state.
  System Locking Mechanism: SAP uses a locking mechanism to prevent data inconsistencies. If a change number is being used in a transaction, it will be locked until that transaction is completed.
  
  Solution:
  To resolve the DG311 error, you can take the following steps:
  
  
  Check Lock Entries:
  
  Use transaction code SM12 to check for lock entries related to the change number. You can filter by the user or the object type to find the specific lock.
  If you find a lock that is no longer needed (e.g., a user has left the session without releasing the lock), you can delete the lock entry if you have the necessary authorizations.
  
  
  
  Communicate with Users:
  
  If another user is legitimately working on the change number, communicate with them to understand their progress and when they expect to release the lock.
  
  
  
  Wait and Retry:
  
  If the lock is temporary, you may simply need to wait until the other user completes their work and releases the lock.
  
  
  
  Check for Background Jobs:
  
  Sometimes, background jobs may also lock change numbers. Check transaction SM37 to see if any background jobs are running that might be using the change number.
  
  
  
  System Administrator Intervention:
  
  If you are unable to resolve the issue, you may need to contact your SAP Basis or system administrator for assistance. They can help identify the cause of the lock and take appropriate action.
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  SM12: Display and manage lock entries.
  SM37: Monitor background jobs.
  SE03: Transport Organizer Tools, which can also help in managing change numbers and related objects.
  
  
  
  Documentation: Refer to SAP Help documentation for more details on change management and locking mechanisms.
  
  
  User Authorizations: Ensure that you have the necessary authorizations to view and manage locks in the system.
  
  
  By following these steps, you should be able to identify the cause of the DG311 error and take appropriate action to resolve it.