How To Fix /SCMTMS/EXTRACTORS021 - Internal error: not possible to lock entry when filling cluster table &1

SAP Error Message - Details

• Message type: E = Error

• Message class: /SCMTMS/EXTRACTORS -

• Message number: 021

• Message text: Internal error: not possible to lock entry when filling cluster table &1

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SCMTMS/EXTRACTORS021 - Internal error: not possible to lock entry when filling cluster table &1 ?

  The SAP error message /SCMTMS/EXTRACTORS021 Internal error: not possible to lock entry when filling cluster table &1 typically occurs in the context of the SAP Transportation Management System (TMS) when there is an issue with locking entries in a cluster table during data extraction or processing.
  Cause:
  
  Concurrency Issues: This error often arises when multiple processes or users are trying to access or modify the same data simultaneously, leading to a locking conflict.
  Database Locking: The database may not be able to lock the required entries due to existing locks held by other transactions or processes.
  System Performance: High system load or performance issues can also lead to locking problems, as the system may struggle to manage concurrent access to the database.
  Configuration Issues: There may be configuration issues in the TMS or related modules that affect how data is extracted and processed.
  
  Solution:
  
  Check for Locks: Use transaction code SM12 to check for existing locks on the relevant database tables. If you find locks that are no longer needed, you can release them.
  Review Background Jobs: If the error occurs during a background job, check the job logs for any other errors or warnings that might indicate what went wrong.
  Increase Lock Timeout: If the system is under heavy load, consider increasing the lock timeout settings in the system configuration.
  Optimize Performance: Analyze the performance of the system and optimize any long-running queries or processes that may be causing delays.
  Check for Updates: Ensure that your SAP system is up to date with the latest support packages and patches, as these may contain fixes for known issues.
  Consult SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that may address this specific error or provide additional troubleshooting steps.
  Contact SAP Support: If the issue persists after trying the above solutions, consider reaching out to SAP Support for further assistance.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with transaction codes like SM12 (to view and manage locks), SM21 (to check system logs), and ST22 (to analyze dumps) for troubleshooting.
  SAP Documentation: Review the official SAP documentation for TMS and related modules to understand the data extraction processes and locking mechanisms.
  Performance Monitoring: Use tools like SAP Solution Manager or transaction ST03N to monitor system performance and identify bottlenecks.
  
  By following these steps, you should be able to diagnose and resolve the locking issue that is causing the error message.