Message type: E = Error
Message class:  CNV20305 - Messages for conversion packages in CO 
Message number: 610
Message text: Problem in routine CNV_20305_DOCNR: Type field empty (DOCCT)
Routine CNV_20305_DOCNR converts a field based on the type in field
DOCCT.
During the conversion, there were cases where field DOCCT was empty
while field DOCNR was filled.
Additional information: The value of the field that is meant to be
converted is &V2&.
The routine cannot convert the current field.
However the conversion is continued for the other fields and records.
An analysis is required to find out how the routine should react to the
unknown type; if necessary, the routine must be changed accordingly.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message CNV20305610, which indicates a problem in the routine CNV_20305_DOCNR with the message "Type field empty (DOCCT)," typically arises during data migration or conversion processes, particularly when using the SAP S/4HANA Migration Cockpit or similar tools. This error suggests that the system encountered an empty or missing value in a field that is expected to contain a document type (DOCCT).
Cause: Missing Data: The most common cause of this error is that the source data being migrated does not contain a value for the document type field (DOCCT). This could be due to incomplete data extraction or transformation processes. Incorrect Mapping: There may be an issue with how the fields are mapped between the source and target systems, leading to the document type not being populated correctly. Data Format Issues: The data format in the source system may not match the expected format in the target system, causing the migration routine
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