How To Fix CNV_PE_GEN121 - Generation of main function group (&1)

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_PE_GEN - Messages for object generation

• Message number: 121

• Message text: Generation of main function group (&1)

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_PE_GEN121 - Generation of main function group (&1) ?

  The SAP error message CNV_PE_GEN121, which states "Generation of main function group (&1) failed," typically occurs during the execution of a conversion or migration project, particularly when using the SAP S/4HANA Migration Cockpit or other data migration tools. This error indicates that there was a problem generating a function group that is necessary for the migration process.
  Causes:
  
  Syntax Errors: There may be syntax errors in the ABAP code or in the function group being generated.
  Missing Objects: Required objects (like tables, function modules, or classes) may be missing or not properly defined in the system.
  Authorization Issues: The user executing the migration may not have the necessary authorizations to create or modify function groups.
  System Configuration: There may be issues with the system configuration or inconsistencies in the development environment.
  Transport Issues: If the function group is being transported from another system, there may be issues with the transport itself.
  
  Solutions:
  
  Check Syntax: Review the ABAP code for any syntax errors. You can do this by using the ABAP Editor (SE38) to check the function group for errors.
  Verify Objects: Ensure that all required objects are present and correctly defined in the system. This includes checking for missing tables, function modules, or classes.
  Review Authorizations: Make sure that the user has the necessary authorizations to create and modify function groups. You may need to consult with your security team to ensure proper roles are assigned.
  Check System Logs: Look at the system logs (transaction SLG1) for more detailed error messages that can provide additional context on what went wrong.
  Re-transport Objects: If the function group is being transported, ensure that the transport is complete and that all necessary objects are included.
  Consult SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address this specific error or provide patches or updates that could resolve the issue.
  
  Related Information:
  
  Transaction Codes: You may want to use transaction codes like SE80 (Object Navigator) to investigate the function group and related objects.
  SAP Community: Engaging with the SAP Community forums can provide insights from other users who may have encountered similar issues.
  SAP Support: If the issue persists, consider reaching out to SAP Support for assistance, especially if you have a support contract.
  
  By following these steps, you should be able to identify the root cause of the CNV_PE_GEN121 error and implement a solution to resolve it.