Message type: E = Error
Message class:  CNV - Conversion: Messages for Conversion Services (CNCC) 
Message number: 794
Message text: There is no field for aggregation defined for the table &1
No field was selected to be aggregate in table &V1& although the
duplicate processing type was set to "Aggregate Function".
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Select fields to aggregate or change duplicate processing method.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message CNV794 "There is no field for aggregation defined for the table &1" typically occurs during data migration or conversion processes, particularly when using the SAP S/4HANA Migration Cockpit or other data migration tools. This error indicates that the system is unable to find a field in the specified table that can be used for aggregation, which is necessary for the data processing being attempted.
Cause: Missing Aggregation Field: The table specified in the error message does not have a designated field that can be used for aggregation. This is often the case if the table structure does not include a numeric or key field that can be summed or counted. Incorrect Configuration: The data migration configuration may not be set up correctly, leading to the system not recognizing the appropriate fields for aggregation. Data Model Changes: If there have been changes to the data model (e.g., during an upgrade or
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