How To Fix MAHD004 - Lock on table MAHD(-OVAL) could not be set for plant &1

SAP Error Message - Details

• Message type: E = Error

• Message class: MAHD - Messages for Alternative Historical Data

• Message number: 004

• Message text: Lock on table MAHD(-OVAL) could not be set for plant &1

What causes this issue?

The system could not lock tables MAHD or MAHD_OVAL.
This could be because a process is currently running or because a user
is currently processing a requested record.

System Response

<DS:GLOS.70086ED0D946154EBC7C6B32697A9C30>Alternative historical data
</>(AHD) could not be loaded for the entire MRP area.

How to fix this error?

Release all records for the requested MRP area that are currently locked
and restart the program.

Procedure for System Administrators

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 MAHD004 - Lock on table MAHD(-OVAL) could not be set for plant &1 ?

  The SAP error message MAHD004 indicates that there is a lock issue on the table MAHD (which is related to the Material Master data) for a specific plant. This error typically occurs when multiple users or processes are trying to access or modify the same data simultaneously, leading to a conflict in locking mechanisms.
  Cause:
  
  Concurrent Access: Multiple users or processes are trying to access or modify the same material data at the same time.
  Long-running Transactions: A transaction that takes too long to complete may hold a lock on the table, preventing others from accessing it.
  System Performance Issues: If the system is under heavy load, it may not be able to manage locks effectively.
  Database Issues: Problems with the underlying database can also lead to locking issues.
  
  Solution:
  
  Wait and Retry: Often, simply waiting for a few moments and then retrying the operation can resolve the issue, especially if it was caused by a temporary lock.
  Identify Locking Users: Use transaction code SM12 to check for existing locks on the table MAHD. You can identify which user or process is holding the lock and take appropriate action.
  Terminate Long-running Transactions: If you identify a transaction that is holding a lock for too long, you may need to terminate it (if appropriate) to release the lock.
  Check for Background Jobs: Sometimes, background jobs may be running that are causing locks. Check transaction SM37 to see if any jobs are running that might be affecting the table.
  System Performance: If the issue is frequent, consider checking the overall performance of the SAP system and the database. Optimizing performance may help reduce locking issues.
  Consult Basis Team: If the problem persists, it may be necessary to involve your SAP Basis team to investigate further, as they can analyze system logs and performance metrics.
  
  Related Information:
  
  Transaction Codes:
  
  SM12: To view and manage locks.
  SM37: To check background jobs.
  SE11: To view the structure of the MAHD table.
  
  
  SAP Notes: Check SAP Notes for any known issues or patches related to locking problems in the MAHD table.
  Documentation: Review SAP documentation for best practices on managing locks and concurrent access in SAP systems.
  
  By following these steps, you should be able to diagnose and resolve the MAHD004 error effectively.