How To Fix UMM_CUSTOMIZING001 - User '&1' is already using the transaction

SAP Error Message - Details

• Message type: E = Error

• Message class: UMM_CUSTOMIZING - Messages from the Management Cockpit Maintenance Transaction

• Message number: 001

• Message text: User '&1' is already using the transaction

What causes this issue?

Because of the multiple use of the objects of a Management Cockpit, the
transaction cannot be started by more than one user at any one time.

System Response

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

How to fix this error?

Call up the transaction at a later point in time, or contact the
processor "&V1".

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 UMM_CUSTOMIZING001 - User '&1' is already using the transaction ?

  The SAP error message UMM_CUSTOMIZING001 indicates that a user is trying to access a transaction that is already being used by another session or user. This is a common issue in SAP environments where multiple users may attempt to access the same transaction simultaneously.
  Cause:
  
  Concurrent Access: The primary cause of this error is that the transaction is already open in another session by the same user or by another user.
  Lock Mechanism: SAP has a locking mechanism to prevent data inconsistencies. When a user opens a transaction, it locks certain resources, and if another user tries to access the same transaction, they may encounter this error.
  Session Management: If a user has multiple sessions open, they may inadvertently try to access the same transaction in more than one session.
  
  Solution:
  
  Check Active Sessions: The user should check if they have multiple sessions open and close any unnecessary ones. They can do this by logging out of the other sessions or using transaction SM04 to view active sessions.
  Wait for Release: If another user is using the transaction, the current user may need to wait until that user completes their task and releases the lock.
  Use Different Transaction: If possible, the user can try to use a different transaction or function that does not conflict with the one they are trying to access.
  Contact Administrator: If the issue persists, it may be necessary to contact the SAP system administrator to investigate further. They can check for any system locks or issues that may be causing the error.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with transaction codes like SM04 (User Overview) and SM12 (Lock Entries) to monitor user sessions and locks.
  SAP Notes: Check SAP Notes for any specific patches or updates related to this error message, as there may be known issues or fixes provided by SAP.
  User Training: Ensure that users are trained on how to manage their sessions effectively to avoid this error in the future.
  
  By following these steps, users can typically resolve the UMM_CUSTOMIZING001 error and continue their work in SAP.