Message type: E = Error
Message class:  CNV21500 - Messages for HR conversions basis 
Message number: 017
Message text: Import/export routine type '&1' not supported.
Import/export routine type '&v1&' not supported.
At the moment only supported types are:
macros,
function modules.
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 CNV21500017, which states "Import/export routine type '&1' not supported," typically occurs during data migration or conversion processes, particularly when using the SAP Landscape Transformation (SLT) or other data migration tools. This error indicates that the specified import/export routine type is not recognized or supported by the system.
Cause: Unsupported Routine Type: The routine type specified in the error message is not defined or is not supported in the current context of the data migration process.
Configuration Issues: There may be configuration issues in the data migration settings or the routines themselves. Version Compatibility: The version of the SAP system or the migration tool being used may not support the specified routine type. Missing Custom Code: If the routine is a custom routine, it may not be properly implemented or activated in the system.
Solution: Check Routine Type: Verify the routine type specified in the error message. Ensure that it is correctly defined and
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