How To Fix MM123 - Generic material &1 locked by user &3 in reference plant &2

SAP Error Message - Details

• Message type: E = Error

• Message class: MM - Messages for material master maintenance and Customizing

• Message number: 123

• Message text: Generic material &1 locked by user &3 in reference plant &2

What causes this issue?

Since the material specified is a generic material, the system has
tried to lock it in the reference plant of the plant specified.

System Response

The system cannot lock the generic material in the reference plant.

How to fix this error?

Try again later.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MM123 - Generic material &1 locked by user &3 in reference plant &2 ?

  The SAP error message MM123 indicates that a generic material is locked by a specific user in a reference plant. This typically occurs when a user is trying to perform an operation on a material that is currently being edited or processed by another user. Here’s a breakdown of the cause, potential solutions, and related information for this error:
  Cause:
  
  User Lock: The material is locked by another user who is currently editing or processing it. This can happen during transactions such as creating, changing, or deleting material master data.
  Session Timeout: Sometimes, a user may have left a session open, causing the lock to persist even after they have stopped working on it.
  System Error: Occasionally, system errors or crashes can lead to locks not being released properly.
  
  Solution:
  
  Identify the Locking User: Check who is currently locking the material. You can do this by using transaction code SM12 (Display and Delete Locks). Look for the user ID mentioned in the error message.
  Contact the User: If possible, contact the user who is locking the material to see if they can release the lock by completing their transaction or logging out.
  Release the Lock: If the locking user is unavailable or the lock is no longer valid (e.g., due to a session timeout), an administrator can manually delete the lock using transaction code SM12. However, this should be done with caution to avoid data inconsistencies.
  Wait and Retry: If the lock is legitimate and the user is actively working on the material, it may be best to wait until they finish their work and then retry the operation.
  Check for Background Jobs: Sometimes, background jobs may also lock materials. Check if any background jobs are running that might be causing the lock.
  
  Related Information:
  
  Transaction Codes:
  
  SM12: To view and manage locks.
  MM02: To change material master data.
  MM03: To display material master data.
  
  
  User Roles and Authorizations: Ensure that users have the appropriate roles and authorizations to access and modify material data.
  System Performance: If locks are frequent, it may indicate performance issues or a need for better user training on how to manage material data effectively.
  
  Best Practices:
  
  Encourage users to log out of sessions when they are done to prevent unnecessary locks.
  Implement training sessions for users on how to handle material master data properly.
  Regularly monitor and manage locks in the system to ensure smooth operations.
  
  By following these steps, you should be able to resolve the MM123 error and minimize its occurrence in the future.