Message type: E = Error
Message class:  CNV21500 - Messages for HR conversions basis 
Message number: 016
Message text: Macro &1 found in include &2.
Macro &v1& found in include &v2&.
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 CNV21500016 typically relates to issues encountered during data migration or conversion processes, particularly when using the SAP S/4HANA Migration Cockpit or other data migration tools. The message indicates that a macro (denoted as &1) was found in a specific include program (denoted as &2), which may not be properly defined or is causing issues during the execution of the migration process.
Cause: Missing or Incorrect Macro Definition: The macro referenced in the error message may not be defined correctly or is missing in the include file. Incompatibility: The macro may be incompatible with the current version of the SAP system or the data being processed.
Configuration Issues: There may be configuration issues in the migration settings or parameters that lead to the macro being invoked incorrectly. Custom Code: If there are custom developments or modifications in the include file, they may not align with the expected standards or practices.
Solution: Check Macro Definition:
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