How To Fix OPS_SE_HUM_XI_PROX021 - exactly once request: enqueue failure: &1

SAP Error Message - Details

• Message type: E = Error

• Message class: OPS_SE_HUM_XI_PROX - Message class for XI HU messages

• Message number: 021

• Message text: exactly once request: enqueue failure: &1

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message OPS_SE_HUM_XI_PROX021 - exactly once request: enqueue failure: &1 ?

  The SAP error message OPS_SE_HUM_XI_PROX021 indicates an "enqueue failure" related to the "exactly once" request processing in the SAP system. This error typically occurs in scenarios where the system is trying to ensure that a message is processed exactly once, but it encounters a problem with acquiring the necessary lock (enqueue) for that operation.
  Cause:
  
  Lock Contention: The most common cause of this error is that another process is holding the lock that your process is trying to acquire. This can happen if multiple processes are trying to access the same resource simultaneously.
  Long-running Transactions: If a transaction takes too long to complete, it may hold onto the lock longer than expected, causing other requests to fail.
  System Configuration Issues: There may be configuration issues in the SAP system that affect how locks are managed.
  Database Issues: Problems with the underlying database can also lead to enqueue failures.
  
  Solution:
  
  Check Lock Entries: Use transaction code SM12 to check for existing lock entries. Identify if there are any locks held by other users or processes that are causing the contention.
  Release Locks: If you find unnecessary locks, you can release them (if you have the necessary permissions) or ask the user holding the lock to release it.
  Optimize Transactions: Review the transactions that are causing the locks to ensure they are optimized and do not hold locks longer than necessary.
  Increase Lock Timeout: If appropriate, consider increasing the lock timeout settings in the system configuration to allow for longer wait times before failing.
  Monitor System Performance: Use transaction codes like ST22 (dump analysis) and SM21 (system log) to monitor for any performance issues or errors that may be contributing to the problem.
  Consult SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  
  Related Information:
  
  Transaction Codes:
  
  SM12: Display and manage lock entries.
  SM21: View system logs for errors and warnings.
  ST22: Analyze dumps that may provide insights into system errors.
  
  
  SAP Documentation: Refer to the official SAP documentation for more details on enqueue mechanisms and exactly-once processing.
  SAP Community: Engage with the SAP Community forums for discussions and solutions shared by other users who may have encountered similar issues.
  
  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.