How To Fix CNV_20900122 - Maintain mapping (Optional): Activity not possible at this moment

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_20900 - Message class for package CNV_20900

• Message number: 122

• Message text: Maintain mapping (Optional): Activity not possible at this moment

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_20900122 - Maintain mapping (Optional): Activity not possible at this moment ?

  The SAP error message CNV_20900122 with the description "Maintain mapping (Optional): Activity not possible at this moment" typically occurs during data migration or conversion processes, particularly when using SAP's Conversion Tools or the SAP S/4HANA Migration Cockpit. This error indicates that the system is unable to perform the requested mapping activity at that moment.
  Possible Causes:
  
  Locking Issues: The data or mapping table might be locked by another user or process, preventing you from making changes.
  Incomplete Configuration: The migration or conversion process may not be fully configured, leading to issues when trying to maintain mappings.
  System Performance: High system load or performance issues could temporarily prevent the execution of certain activities.
  Authorization Issues: The user may not have the necessary authorizations to perform the mapping activity.
  Technical Errors: There could be underlying technical issues or bugs in the migration tool or the SAP system itself.
  
  Solutions:
  
  Check Locks: Use transaction codes like SM12 to check for any locks on the relevant tables. If you find locks, you may need to wait for them to be released or contact the user who holds the lock.
  Review Configuration: Ensure that all necessary configurations for the migration process are complete. Check the settings in the Migration Cockpit or the relevant transaction.
  System Performance: Monitor system performance using transaction SM66 or ST22 to identify any performance bottlenecks. If the system is under heavy load, consider performing the activity during off-peak hours.
  Authorization Check: Verify that the user has the appropriate authorizations to perform the mapping activity. You can check this using transaction SU53 after the error occurs.
  Retry the Activity: Sometimes, simply retrying the activity after a short period can resolve the issue, especially if it was caused by temporary system conditions.
  Consult Logs: Check the application logs (transaction SLG1) for any additional error messages or warnings that could provide more context about the issue.
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that may address this specific error or provide patches or updates.
  
  Related Information:
  
  SAP Documentation: Review the official SAP documentation for the specific migration tool you are using, as it may provide additional insights or troubleshooting steps.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they found effective.
  Support Ticket: If the issue persists and you cannot resolve it, consider opening a support ticket with SAP for further assistance.
  
  By following these steps, you should be able to diagnose and potentially resolve the error CNV_20900122.