How To Fix /SCWM/MONITOR131 - A lock has been set for queue &1

SAP Error Message - Details

• Message type: E = Error

• Message class: /SCWM/MONITOR -

• Message number: 131

• Message text: A lock has been set for queue &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 /SCWM/MONITOR131 - A lock has been set for queue &1 ?

  The SAP error message /SCWM/MONITOR131 A lock has been set for queue &1 typically occurs in the context of the SAP Extended Warehouse Management (EWM) module. This error indicates that a lock has been placed on a specific queue, preventing further processing or modifications until the lock is released.
  Cause:
  
  Concurrent Processing: The most common cause of this error is that another process or user is currently working on the same queue. This can happen if multiple users or background jobs are trying to access or modify the same queue simultaneously.
  System Locking Mechanism: SAP uses a locking mechanism to ensure data integrity. If a transaction is in progress and has not yet been completed, a lock will be set on the relevant queue.
  Long-Running Transactions: If a transaction takes too long to complete, it may hold the lock longer than expected, causing other processes to encounter this error.
  
  Solution:
  
  Wait and Retry: Often, the simplest solution is to wait for the current process to complete. Once the lock is released, you can retry your operation.
  Identify the Lock: Use transaction code SM12 to check for locks in the system. You can filter by the user or the object type to identify which user or process is holding the lock.
  Release the Lock: If you identify a lock that is no longer needed (e.g., a user has left the session open), you can manually release it from the SM12 transaction. However, be cautious when doing this, as it may lead to data inconsistencies if the original process is still running.
  Check for Long-Running Jobs: If the lock is due to a long-running job, you may need to investigate the job and determine if it can be optimized or if it needs to be terminated.
  Review Custom Code: If you have custom developments that interact with queues, review the code to ensure that locks are being handled appropriately.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SM12 (to view and manage locks), SM21 (to check system logs), and ST22 (to check for dumps).
  SAP Notes: Check for any relevant SAP Notes that may address specific issues related to this error message. SAP Notes can provide patches or workarounds for known issues.
  Documentation: Review the SAP EWM documentation for best practices on managing queues and understanding the locking mechanism.
  
  If the issue persists after trying the above solutions, it may be beneficial to consult with your SAP Basis team or SAP support for further assistance.