How To Fix MDU004 - Master data lot &1 (appl. &2) is being processed by &3

SAP Error Message - Details

• Message type: E = Error

• Message class: MDU - Master Data Update: Master Data Lot

• Message number: 004

• Message text: Master data lot &1 (appl. &2) is being processed by &3

Self-Explanatory Message

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.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message MDU004 - Master data lot &1 (appl. &2) is being processed by &3 ?

  The SAP error message MDU004 indicates that a master data lot is currently being processed by another user or session. This typically occurs in scenarios where multiple users or processes are trying to access or modify the same piece of master data simultaneously, leading to a lock situation.
  Cause:
  
  Concurrent Access: Another user or background job is currently processing the same master data lot.
  Long-running Transactions: A transaction that takes a long time to complete may hold a lock on the master data.
  System Configuration: Certain configurations in the system may lead to locks being held longer than necessary.
  
  Solution:
  
  Wait and Retry: If the lock is temporary, waiting for a few moments and then retrying the operation may resolve the issue.
  Identify the Lock: Use transaction codes like SM12 (to view and manage locks) to identify which user or process is holding the lock on the master data lot.
  Contact the User: If you identify the user or process holding the lock, you can contact them to see if they can release the lock.
  Terminate the Session: If necessary and if you have the appropriate permissions, you can terminate the session that is holding the lock using transaction SM12.
  Check for Background Jobs: Sometimes, background jobs may be processing the data. Check transaction SM37 to see if any jobs are running that might be causing the lock.
  Review System Performance: If locks are frequent, it may be worth reviewing system performance and configurations to optimize transaction handling.
  
  Related Information:
  
  Transaction Codes:
  
  SM12: To view and manage locks.
  SM37: To check background jobs.
  SM21: To view system logs for any related errors or warnings.
  
  
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  Documentation: Review SAP documentation for best practices on handling master data and locking mechanisms.
  
  If the issue persists after trying the above solutions, it may be necessary to involve your SAP Basis team or support for further investigation.