How To Fix CNV_PE792 - Only fields of the data model root table are allowed

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_PE - General messages for posting engine

• Message number: 792

• Message text: Only fields of the data model root table are allowed

What causes this issue?

You are configuring a transformation for a transfer method parameter
&V1& which is a standalone field. The only allowed data model parameters
are fields of the root table.

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?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_PE792 - Only fields of the data model root table are allowed ?

  The SAP error message CNV_PE792: Only fields of the data model root table are allowed typically occurs during data migration or transformation processes, particularly when using SAP's data migration tools like the SAP S/4HANA Migration Cockpit or other data conversion tools. This error indicates that there is an attempt to access or manipulate fields that are not part of the root table of the data model being processed.
  Cause:
  
  Incorrect Field Mapping: The error often arises when fields from child tables or non-root tables are included in the data model or mapping configuration. The migration tool expects only fields from the root table to be processed.
  Data Model Configuration: The data model may not be correctly defined, leading to the inclusion of non-root fields in the migration process.
  Incompatible Data Structure: The structure of the source data may not align with the expected structure of the target data model, causing the tool to reference fields that are not allowed.
  
  Solution:
  
  Review Field Mapping: Check the mapping configuration in the migration tool. Ensure that only fields from the root table are included in the mapping. Remove any references to fields from child tables or unrelated tables.
  Adjust Data Model: If necessary, adjust the data model configuration to ensure that it correctly reflects the relationships and hierarchy of the data. This may involve redefining the root table or its associated fields.
  Consult Documentation: Refer to the SAP documentation for the specific migration tool you are using. There may be guidelines or best practices for setting up the data model and mapping fields.
  Test with Sample Data: Before running a full migration, test the process with a small set of sample data to ensure that the configuration is correct and that the error does not occur.
  Seek Support: If the issue persists, consider reaching out to SAP support or consulting with an SAP expert who can provide insights based on your specific scenario.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional context on data migration issues.
  Migration Cockpit Documentation: Review the official SAP documentation for the Migration Cockpit or the specific tool you are using, as it may contain troubleshooting tips and examples.
  Community Forums: Engage with the SAP Community or other forums where SAP professionals discuss similar issues. You may find others who have encountered and resolved the same error.
  
  By following these steps, you should be able to identify the cause of the CNV_PE792 error and implement a solution to resolve it.