How To Fix CNV797 - Data type &3 of the field &1 of the table &2 is not allowed

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV - Conversion: Messages for Conversion Services (CNCC)

• Message number: 797

• Message text: Data type &3 of the field &1 of the table &2 is not allowed

What causes this issue?

The values of the field &V1& in the table &V2& are processed by the
aggregate function (selected Aggregate Function: '&V4&'). In these
cases, the field &V1& must be of a numeric type (CURR, DEC, FLTP, INT1,
INT2, INT4, NUMC, PREC or QUAN). However the field &V1& is of type &V3&.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNV797 - Data type &3 of the field &1 of the table &2 is not allowed ?

  The SAP error message CNV797 indicates that there is an issue with the data type of a field in a table during a data conversion or migration process. Specifically, it means that the data type of the field is not allowed or is incompatible with the expected data type for that particular operation.
  Cause:
  
  Incompatible Data Types: The field in question has a data type that is not supported by the conversion program or the target structure.
  Data Type Mismatch: The source data type does not match the expected data type in the target system or table.
  Configuration Issues: There may be configuration settings in the data migration tool that are not aligned with the data types being used.
  Custom Fields: If the field is a custom field, it may not have been properly defined in the target system.
  
  Solution:
  
  Check Data Types: Review the data types of the field in both the source and target systems. Ensure that they are compatible.
  Modify Data Mapping: If you are using a data migration tool, check the mapping configuration to ensure that the data types are correctly defined.
  Adjust Source Data: If possible, modify the source data to match the expected data type in the target system.
  Consult Documentation: Refer to the SAP documentation for the specific migration tool you are using to understand the supported data types and any limitations.
  Custom Development: If the field is custom, ensure that it is properly defined in the target system and that any necessary adjustments are made to accommodate the data type.
  Testing: After making changes, perform a test migration to verify that the issue has been resolved.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide guidance on data type compatibility.
  Data Migration Tools: Familiarize yourself with the specific data migration tool you are using (e.g., SAP S/4HANA Migration Cockpit, LSMW, etc.) and its requirements regarding data types.
  Field Definitions: Review the field definitions in both the source and target systems to ensure that they align with the expected data types.
  
  If the issue persists after following these steps, consider reaching out to SAP support or consulting with an SAP expert who can provide more tailored assistance based on your specific scenario.