Message type: E = Error
Message class:  CNV21500 - Messages for HR conversions basis 
Message number: 042
Message text: No exp. rout. entry in CNV_INDX_MACROS for <&1,&2>. Using function module
No entry in CNV_INDX_MACROS indicating export routine for RELID <
&v1&,&v2&>.
Structure of this cluster RELID is, however, defined in DDIC so default
payroll function module will be used: PYXX_WRITE_PAYROLL_RESULT.
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 CNV21500042 indicates that there is no corresponding entry in the table CNV_INDX_MACROS for the specified parameters. This error typically occurs during data migration or conversion processes, particularly when using the SAP Conversion Tools or during the execution of a function module that relies on these macros.
Cause: Missing Entries: The most common cause of this error is that the required entries for the specified parameters (usually related to the migration or conversion process) are missing in the CNV_INDX_MACROS table. Incorrect Configuration: There may be a misconfiguration in the migration settings or the mapping of data that leads to the absence of expected entries. Version Mismatch: If you are using a different version of the migration tool or if the system has not been properly updated, it may lead to discrepancies in the expected entries.
Solution: Check the CNV_INDX_MACROS Table: Use transaction code SE11 or SE16 to view the contents of the CNV_INDX_MACROS
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What causes this issue?  No entry in CNV_INDX_MACROS indicating import routine for RELID < &v1&,&v2&>. Structure of this cluster...
CNV21500040 Structure of RELID <&1,&2> defined in DDIC, however exp. routine is macro
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Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
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