Message type: E = Error
Message class:  CNV - Conversion: Messages for Conversion Services (CNCC) 
Message number: 796
Message text: Incorrect aggregation function value for the field &1 of table &2
Either no aggregate function has been defined for the field &V1& of the
table &V2&, or the type of this function is incorrect. Only the form
routines are allowed here.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Correct the corresponding entry in the table CNVFIELDS.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message CNV796 "Incorrect aggregation function value for the field &1 of table &2" typically occurs during data migration or conversion processes, particularly when using the SAP S/4HANA Migration Cockpit or similar tools. This error indicates that there is an issue with the aggregation function specified for a particular field in a table during the data transformation process.
Cause: Invalid Aggregation Function: The aggregation function specified for the field is not valid or not supported for that particular field or table. Data Type Mismatch: The data type of the field may not be compatible with the specified aggregation function.
Configuration Issues: There may be configuration issues in the migration settings or mapping that lead to incorrect aggregation function assignments. Custom Fields: If the field is a custom field, it may not have been properly defined in the migration settings.
Solution: Check Aggregation Function: Review the aggregation function specified for the field in the migration settings.
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