How To Fix DMC_GENERAL394 - Migration Object &1 locked by another process; no changes allowed

SAP Error Message - Details

• Message type: E = Error

• Message class: DMC_GENERAL - MWB: General Messages

• Message number: 394

• Message text: Migration Object &1 locked by another process; no changes allowed

What causes this issue?

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

System Response

How to fix this error?

Check whether a data transfer for the migration object is in process.
Make changes or synchronize the staging tables with the migration object
after the data transfer completes.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message DMC_GENERAL394 - Migration Object &1 locked by another process; no changes allowed ?

  The SAP error message DMC_GENERAL394 indicates that a migration object is currently locked by another process, which prevents any changes from being made to it. This is a common issue in systems where multiple processes or users may be trying to access or modify the same migration object simultaneously.
  Cause:
  
  
  Concurrent Access: The most common cause of this error is that another user or process is currently using the migration object. This could be due to:
  
  Another migration job running in parallel.
  A user session that has not been properly closed or has timed out.
  A background job that is still processing the migration object.
  
  
  
  Locking Mechanism: SAP uses a locking mechanism to ensure data integrity. When a migration object is being processed, it is locked to prevent other processes from making changes until the current process is completed.
  
  
  Solution:
  
  
  Identify the Lock:
  
  Use transaction SM12 to check for locks on the migration object. You can filter by the object name or user to find the specific lock.
  If you find a lock that is no longer needed (e.g., a session that has crashed or a job that is stuck), you can delete the lock entry.
  
  
  
  Wait for Completion: If the lock is due to a legitimate process that is still running, you may need to wait for that process to complete before attempting to make changes to the migration object.
  
  
  Check Background Jobs: Use transaction SM37 to check for any background jobs that might be using the migration object. If you find a job that is taking too long, you may need to investigate further.
  
  
  Restart the Process: If you suspect that the process holding the lock is no longer valid (e.g., it has failed), you may need to restart the migration process after ensuring that the lock has been released.
  
  
  Contact Support: If you are unable to resolve the issue, consider reaching out to your SAP support team for assistance. They may have additional tools or insights to help diagnose and resolve the locking issue.
  
  
  Related Information:
  
  
  Transaction Codes:
  
  SM12: To view and manage locks.
  SM37: To monitor background jobs.
  DMC: Data Migration Cockpit, where the migration objects are managed.
  
  
  
  Best Practices:
  
  Avoid running multiple migration jobs that target the same objects simultaneously.
  Regularly monitor and manage background jobs to prevent long-running processes from causing locks.
  Implement proper session management to ensure that sessions are closed correctly.
  
  
  
  By following these steps, you should be able to resolve the DMC_GENERAL394 error and continue with your migration tasks.