How To Fix CNV789 - Wrong routine type for aggregate routine &3 (field &2 of table &1)

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 789

• Message text: Wrong routine type for aggregate routine &3 (field &2 of table &1)

What causes this issue?

Aggregate routines must be of type 'F' (form routines). The routine &V3&
provided for field &V2& of table &V1& has another type.

System Response

Status is set to 'Error'.

How to fix this error?

Provide a form routine to aggregate field &V2& of table &V1& or choose
another duplicate handling type.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNV789 - Wrong routine type for aggregate routine &3 (field &2 of table &1) ?

  The SAP error message CNV789 indicates that there is a problem with the routine type specified for an aggregate routine in a data conversion or migration process. This error typically occurs during the execution of a data migration project, particularly when using the SAP Data Migration Workbench or similar tools.
  Cause:
  The error message "Wrong routine type for aggregate routine &3 (field &2 of table &1)" suggests that:
  
  The routine type defined for the aggregate routine does not match the expected type for the specified field in the specified table.
  There may be a mismatch between the data types or the expected structure of the data being processed.
  The aggregate routine may not be properly defined or configured in the system.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check Routine Definition:
  
  Verify the definition of the aggregate routine in the system. Ensure that the routine type is correctly specified and matches the expected type for the field in question.
  
  
  
  Review Data Types:
  
  Check the data types of the fields in the specified table. Ensure that the data being processed aligns with the expected data types defined in the aggregate routine.
  
  
  
  Adjust Configuration:
  
  If necessary, adjust the configuration of the aggregate routine to ensure it is compatible with the data being processed. This may involve changing the routine type or modifying the logic within the routine.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or notes related to the specific data migration or conversion process you are using. There may be specific guidelines or requirements for defining aggregate routines.
  
  
  
  Test with Sample Data:
  
  If possible, test the aggregate routine with a smaller set of sample data to isolate the issue. This can help identify whether the problem is with specific data entries or the routine itself.
  
  
  
  Seek Support:
  
  If the issue persists, consider reaching out to SAP support or consulting with a technical expert who has experience with data migration projects in SAP.
  
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SE80 (Object Navigator) or SE37 (Function Module) to review and edit routines.
  SAP Notes: Search for SAP Notes related to the CNV789 error message for any patches or updates that may address known issues.
  Data Migration Workbench: Understand the tools and processes involved in the SAP Data Migration Workbench, as this is often where such errors occur.
  
  By following these steps, you should be able to identify and resolve the issue causing the CNV789 error message in your SAP environment.