How To Fix PSSC_TOOLS150 - Enqueue error; object &1 already locked by &2

SAP Error Message - Details

• Message type: E = Error

• Message class: PSSC_TOOLS - Message Class for Periods & Due Date Tools

• Message number: 150

• Message text: Enqueue error; object &1 already locked by &2

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message PSSC_TOOLS150 - Enqueue error; object &1 already locked by &2 ?

  The SAP error message PSSC_TOOLS150 indicates that there is an enqueue error, meaning that a specific object is already locked by another user or process. This typically occurs in scenarios where multiple users or processes are trying to access or modify the same data simultaneously, leading to a conflict.
  Cause:
  The error message can be caused by several factors:
  
  Concurrent Access: Another user or process has locked the object you are trying to access. This can happen in scenarios where multiple users are trying to edit the same record or object.
  Long-Running Transactions: If a transaction takes a long time to complete, it may hold a lock on the object for an extended period, preventing others from accessing it.
  System Configuration: In some cases, the system configuration or custom code may lead to improper handling of locks.
  
  Solution:
  To resolve the enqueue error, you can take the following steps:
  
  
  Identify the Lock:
  
  Use transaction code SM12 to view the list of locks in the system. You can filter by the object name or user to find out who is holding the lock.
  Check the details of the lock to understand which user or process is causing the issue.
  
  
  
  Wait and Retry:
  
  If the lock is held by another user, you may need to wait until they complete their transaction and release the lock. You can communicate with the user to understand their timeline.
  
  
  
  Release the Lock:
  
  If you determine that the lock is no longer needed (for example, if the user has left the session), you can manually delete the lock using transaction SM12. However, be cautious with this approach, as it may lead to data inconsistencies if the other user is still working on the data.
  
  
  
  Review Code and Configuration:
  
  If this error occurs frequently, review any custom code or configurations that may be causing locks to be held longer than necessary. Ensure that transactions are designed to minimize lock duration.
  
  
  
  System Performance:
  
  Monitor system performance and transaction times. If transactions are taking too long, consider optimizing them to reduce the likelihood of lock contention.
  
  
  
  Related Information:
  
  Lock Management: Understanding how SAP handles locks is crucial. SAP uses enqueue locks to prevent data inconsistencies during concurrent access.
  Transaction Codes:
  
  SM12: Display and manage locks.
  SM21: Check system logs for any related errors or warnings.
  ST22: Analyze dumps that may provide insights into issues causing locks.
  
  
  SAP Notes: Check for any relevant SAP Notes that may address specific issues related to enqueue errors or provide patches and updates.
  
  By following these steps, you should be able to diagnose and resolve the enqueue error effectively.