How To Fix /PF1/MSG_CONV558 - Enqueue error

SAP Error Message - Details

• Message type: E = Error

• Message class: /PF1/MSG_CONV -

• Message number: 558

• Message text: Enqueue error

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 /PF1/MSG_CONV558 - Enqueue error ?

  The SAP error message /PF1/MSG_CONV558 typically indicates an enqueue error, which occurs when a process tries to access a resource that is currently locked by another process. This can happen in various scenarios, such as when multiple users or processes attempt to modify the same data simultaneously.
  Cause:
  
  Resource Locking: The most common cause is that the resource (like a table entry or a business object) is locked by another transaction or user.
  Long-running Transactions: If a transaction takes too long to complete, it may hold locks longer than expected, causing other transactions to fail.
  Deadlocks: In some cases, two or more processes may be waiting for each other to release locks, leading to a deadlock situation.
  System Configuration: Incorrect configuration of the enqueue server or issues with the SAP kernel can also lead to enqueue errors.
  
  Solution:
  
  Identify the Lock: Use transaction SM12 to check for existing locks. You can see which user or process is holding the lock and what resource is locked.
  Release the Lock: If you identify a lock that is no longer needed, you can manually delete it from SM12. However, be cautious when doing this, as it may lead to data inconsistency if the process holding the lock is still active.
  Check for Long-running Transactions: Use transaction SM66 to monitor active processes and identify any long-running transactions that may be holding locks.
  Review Code: If the error occurs frequently, review the code for the transactions that are causing the issue. Ensure that locks are being released properly and that transactions are optimized to run quickly.
  Increase Timeout Settings: If appropriate, consider increasing the timeout settings for enqueue locks in the system configuration.
  System Restart: In some cases, restarting the enqueue server or the entire SAP system may resolve persistent locking issues.
  
  Related Information:
  
  Transaction Codes:
  
  SM12: Display and manage locks.
  SM66: Global work process overview.
  SM21: System log for error messages.
  
  
  SAP Notes: Check SAP Notes for any known issues or patches related to enqueue errors.
  Performance Monitoring: Regularly monitor system performance and lock situations to prevent future occurrences.
  
  If the problem persists after trying the above solutions, it may be necessary to consult with your SAP Basis team or SAP support for further assistance.