Message type: E = Error
Message class:  CNV21500 - Messages for HR conversions basis 
Message number: 013
Message text: Unknown export routine for RELID <&1,&2>
Unknown export routine for RELID <&v1&, &v2&>. It is not
indicated in table CNV_INDX_MACROS, how the data should be written to
cluster RELID <&v1&,&v2&>.
For given RELID there should exist an entry in CNV_INDX_MACROS
specifying name and type (function module, macro, etc.) of the routine.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message CNV21500013 indicates that there is an issue with an unknown export routine for a specific RELID (Release ID) in the context of data conversion or migration processes. This error typically arises during the execution of a data migration project, particularly when using SAP's Conversion Tools or during the execution of a specific program related to data transfer.
Cause: Missing or Incorrect Export Routine: The error suggests that the system is trying to call an export routine that is not defined or is incorrectly specified for the given RELID.
Configuration Issues: There may be configuration issues in the data migration settings or the specific program being executed. Version Compatibility: The RELID might not be compatible with the current version of the software or the migration tool being used. Custom Development: If there are custom routines or modifications, they may not be properly registered or could be missing.
Solution: Check Configuration: Verify the configuration settings
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