How To Fix MDG_BS_MAT_CHMNG_API012 - Change number &1 could not be locked

SAP Error Message - Details

• Message type: E = Error

• Message class: MDG_BS_MAT_CHMNG_API - Message class for material change management

• Message number: 012

• Message text: Change number &1 could not be locked

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message MDG_BS_MAT_CHMNG_API012 - Change number &1 could not be locked ?

  The SAP error message MDG_BS_MAT_CHMNG_API012 indicates that a change number could not be locked during a process in the Master Data Governance (MDG) module, specifically related to material changes. This error typically arises when there is a concurrency issue, meaning that another user or process is currently accessing or modifying the change number, preventing your transaction from obtaining the necessary lock.
  Causes:
  
  Concurrent Access: Another user or process is currently using the change number, leading to a lock conflict.
  Long-running Transactions: A transaction that takes a long time to complete may hold the lock longer than expected.
  System Configuration: Issues with the configuration of the locking mechanism in the SAP system.
  Database Locks: Locks at the database level that are not released properly.
  
  Solutions:
  
  Wait and Retry: If the error is due to concurrent access, waiting for a short period and then retrying the operation may resolve the issue.
  Identify Locking User/Process: Use transaction SM12 to check for existing locks on the change number. You can identify the user or process holding the lock and take appropriate action (e.g., contacting the user to release the lock).
  Check for Long-running Transactions: Use transaction SM66 or SM50 to monitor active processes and identify any long-running transactions that may be holding locks.
  System Configuration Review: Review the configuration of the locking mechanism in your SAP system to ensure it is set up correctly.
  Database Administration: If the issue persists, consult with your database administrator to check for any database-level locks or issues that may be affecting the locking mechanism.
  
  Related Information:
  
  Transaction Codes: 
  
  SM12: To view and manage locks.
  SM66: To monitor active processes across the system.
  SM50: To view processes on a specific application server.
  
  
  SAP Notes: Check for any relevant SAP Notes that may address known issues or provide patches related to this error.
  Documentation: Review the SAP Help Portal for documentation on MDG and locking mechanisms to understand how they work and best practices for managing them.
  
  If the problem persists after trying the above solutions, it may be necessary to involve your SAP Basis team or SAP support for further investigation.