How To Fix CNV_MBT218 - Enqueue on local entry session_id &1, subactivity &2, task ID &3 not set

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_MBT - PCL message class

• Message number: 218

• Message text: Enqueue on local entry session_id &1, subactivity &2, task ID &3 not set

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_MBT218 - Enqueue on local entry session_id &1, subactivity &2, task ID &3 not set ?

  The SAP error message CNV_MBT218 typically occurs in the context of data migration or conversion processes, particularly when using the SAP S/4HANA Migration Cockpit or similar tools. This error indicates that there is an issue with the enqueue mechanism for a specific session, subactivity, or task ID during the migration process.
  Cause:
  The error message suggests that the system is unable to set an enqueue lock for a specific session, subactivity, or task. This can happen due to several reasons:
  
  Concurrency Issues: Multiple processes or users may be trying to access or modify the same data simultaneously, leading to contention for the enqueue lock.
  Session Management: The session ID may not be valid or may have expired, causing the system to fail in setting the enqueue.
  Configuration Issues: There may be misconfigurations in the migration settings or the environment that prevent proper locking mechanisms from functioning.
  Database Locks: There could be existing locks in the database that are preventing the enqueue from being set.
  
  Solution:
  To resolve the CNV_MBT218 error, you can try the following steps:
  
  
  Check for Active Sessions: Ensure that there are no other active sessions or processes that might be holding locks on the same resources. You can use transaction codes like SM12 (for lock entries) to check for existing locks.
  
  
  Retry the Process: Sometimes, simply retrying the migration process can resolve transient issues related to locking.
  
  
  Review Configuration: Check the configuration settings for the migration process to ensure that everything is set up correctly. This includes verifying the parameters for the migration cockpit or any related tools.
  
  
  Increase Lock Timeout: If the issue is related to timeout settings, consider increasing the lock timeout settings in the system configuration.
  
  
  Check System Logs: Review the system logs (transaction SLG1) for any additional error messages or warnings that might provide more context about the issue.
  
  
  Contact SAP Support: If the issue persists after trying the above steps, it may be necessary to contact SAP support for further assistance. Provide them with the error message details, session ID, subactivity, and task ID for better diagnosis.
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SM12 (for lock entries), SLG1 (for application logs), and ST22 (for dumps) to troubleshoot further.
  SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that might address this specific error or provide additional troubleshooting steps.
  Documentation: Review the official SAP documentation for the migration tools you are using, as they may contain specific guidelines or known issues related to enqueue locks.
  
  By following these steps, you should be able to diagnose and potentially resolve the CNV_MBT218 error in your SAP environment.