Message type: E = Error
Message class:  CNV_20200_CHECK - Messages for check functions (company code merge) 
Message number: 005
Message text: Participating company codes will be assigned to target CO area &1
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The SAP error message CNV_20200_CHECK005 typically occurs during the data migration process, particularly when using the SAP S/4HANA Migration Cockpit or other data migration tools. This error indicates that there is an issue with the assignment of participating company codes to a target controlling area (CO area).
Cause: The error message suggests that there is a mismatch or inconsistency in the configuration of company codes and controlling areas. Specifically, it may occur due to one of the following reasons: Company Code Assignment: The participating company codes are not correctly assigned to the target controlling area. Each company code must be assigned to a controlling area for proper financial reporting and controlling. Multiple Assignments: If multiple company codes are assigned to different controlling areas, this can lead to conflicts during the migration process.
Configuration Issues: There may be configuration issues in the target system that prevent the proper assignment of company codes to the controlling area.
Solution: To
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