Message type: E = Error
Message class:  CNV_00001 - Message class for CWB settings maintenance programs 
Message number: 104
Message text: Routine for custom priority duplicate handling not defined
No routine for priority handling in case of duplicate keys was
provided, although the type of duplicate entries processing was set to
'Custom priority routine' for table &V1&.
If this setting is not changed, the conversion program for table &V1&
will not be generated properly.
Provide a routine that will handle the duplicate key entries for table
&V1& or change the duplicate handling type.
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 CNV_00001104 indicates that there is an issue with the handling of duplicate entries during a data migration or conversion process, specifically related to the custom priority for duplicate handling not being defined. This error typically arises in the context of SAP's data migration tools, such as the SAP S/4HANA Migration Cockpit or other data conversion tools.
Cause: The error occurs when the system attempts to process duplicate entries but cannot find a defined routine or logic to handle these duplicates according to custom priorities. This can happen due to: Missing Custom Logic: The custom logic for handling duplicates has not been implemented or is not activated in the system.
Configuration Issues: The configuration settings for the data migration process may not have been set up correctly, leading to the absence of a defined routine. Incorrect Data Mapping: The data mapping or transformation rules may not have been properly defined, causing the
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