How To Fix PLM_SE_EAM_SC022 - Exactly-once request cannot be locked: &1 (error code: &2)

SAP Error Message - Details

• Message type: E = Error

• Message class: PLM_SE_EAM_SC - Messages for PLM Services

• Message number: 022

• Message text: Exactly-once request cannot be locked: &1 (error code: &2)

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message PLM_SE_EAM_SC022 - Exactly-once request cannot be locked: &1 (error code: &2) ?

  The SAP error message PLM_SE_EAM_SC022, which states "Exactly-once request cannot be locked: &1 (error code: &2)," typically occurs in the context of SAP's Event Management or similar systems where exactly-once processing is required. This error indicates that the system is unable to lock a specific request for processing, which is essential for ensuring that the request is handled exactly once without duplication or loss.
  Cause:
  
  Concurrency Issues: The error often arises when multiple processes or threads attempt to access the same request simultaneously, leading to a locking conflict.
  Database Locking: The request may be locked by another transaction or process, preventing the current process from obtaining the necessary lock.
  Configuration Issues: There may be misconfigurations in the system that affect how locks are managed for exactly-once requests.
  Long-running Transactions: If a transaction takes too long to complete, it may hold onto locks longer than expected, causing subsequent requests to fail.
  
  Solution:
  
  Check for Active Locks: Use transaction codes like SM12 to check for existing locks on the request. If you find locks that are no longer needed, you can release them.
  Review Transaction Logic: Ensure that your application logic is designed to handle locking appropriately. This may involve implementing retry mechanisms or ensuring that requests are processed in a way that minimizes contention.
  Increase Timeout Settings: If applicable, consider increasing the timeout settings for locks to allow longer-running transactions to complete without causing conflicts.
  Monitor System Performance: Use transaction codes like SM66 or ST04 to monitor system performance and identify any long-running processes that may be causing locking issues.
  Consult SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address this specific error or provide guidance on best practices for handling exactly-once requests.
  
  Related Information:
  
  SAP Documentation: Review the official SAP documentation for Event Management or the specific module you are working with to understand how locking mechanisms work.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they have found.
  System Logs: Check system logs (transaction SLG1) for additional error messages or warnings that may provide more context about the locking issue.
  
  If the problem persists after trying the above solutions, it may be necessary to involve your SAP Basis team or SAP support for further investigation.