How To Fix /SAPAPO/DMMOD006 - Model &2 cannot be changed (locked by user &1)

SAP Error Message - Details

• Message type: E = Error

• Message class: /SAPAPO/DMMOD -

• Message number: 006

• Message text: Model &2 cannot be changed (locked by user &1)

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.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message /SAPAPO/DMMOD006 - Model &2 cannot be changed (locked by user &1) ?

  The SAP error message /SAPAPO/DMMOD006 Model &2 cannot be changed (locked by user &1) typically occurs in the SAP Advanced Planning and Optimization (APO) module when a user attempts to modify a planning model that is currently locked by another user. This locking mechanism is in place to prevent concurrent modifications that could lead to data inconsistencies.
  Cause:
  
  User Lock: The model is locked by another user (indicated by &1 in the error message), which means that the user is currently editing or has opened the model for changes.
  Session Lock: The model may be locked due to an active session that has not been properly closed or released.
  System Lock: Sometimes, system-level locks can occur due to background jobs or processes that are accessing the model.
  
  Solution:
  
  Wait and Retry: If the lock is temporary (e.g., the other user is actively working on the model), you may need to wait until they finish and release the lock.
  Identify the Locking User: You can use transaction code SM12 to check for locks in the system. Look for the user &1 who is locking the model and communicate with them to see if they can release the lock.
  Release the Lock: If the locking user is no longer active or if the session is stuck, an administrator can manually release the lock using transaction SM12. However, this should be done with caution to avoid data loss.
  Check for Background Jobs: Use transaction SM37 to check if there are any background jobs that might be holding the lock on the model. If so, you may need to wait for those jobs to complete or cancel them if appropriate.
  Review User Sessions: If the locking user is not available, you can check their active sessions using transaction AL08 and log them off if necessary (with proper authorization).
  
  Related Information:
  
  Lock Management: Understanding how SAP handles locks is crucial. Locks can be user-specific or system-wide, and knowing how to manage them can help prevent similar issues in the future.
  User Communication: Establishing a protocol for users to communicate when they are working on models can help reduce the frequency of such locks.
  Documentation: Ensure that users are aware of the locking mechanism and the importance of properly closing sessions to avoid leaving locks in place.
  
  By following these steps, you should be able to resolve the error and regain access to the planning model in SAP APO.