Message type: E = Error
Message class:  CNV20305 - Messages for conversion packages in CO 
Message number: 700
Message text: No routine without parameter found for domain &1
To facilitate the conversion of the domain &V1&, the system tried to
find a routine in the table CNVDOMS that does not need any parameters.
However such a routine was not found in CNVDOMS.
Use the transaction CNV_DOMS to enter a routine for converting the
domain &V1& without parameters, then repeat this step.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message CNV20305700 indicates that there is no routine available without parameters for the specified domain. This error typically occurs during data migration or conversion processes, particularly when using the SAP S/4HANA Migration Cockpit or other data transformation tools.
Cause: Missing Routine: The error suggests that the system is looking for a conversion routine that does not require any parameters for the specified domain but cannot find one. Domain Configuration: The domain in question may not have been properly configured or may not have a corresponding routine defined in the system. Data Migration Settings: The settings or mappings in the data migration process may be incorrect or incomplete, leading to the system's inability to find the appropriate routine.
Solution: Check Domain Configuration: Verify the domain settings in the Data Dictionary (transaction SE11) to ensure that the domain is correctly defined and that it has the necessary conversion routines. Define a Conversion Routine: If a routine is missing,
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