How To Fix CNV_20100242 - Proposed conversion routine cannot be changed for SAP tables

CNV_20100242 - Overview

• Message type: E = Error

• Message class: CNV_20100 - Messageclass for chart of account conversion

• Message number: 242

• Message text: Proposed conversion routine cannot be changed for SAP tables

What causes this issue?

You have tried to change a proposed or already assigned conversion
routine for an SAP table field.

System Response

SAP table fields have fixed conversion routines assigned, and you cannot
change these assignments.

How to fix this error?

Confirm the routine for now so that you can continue with your project.
After the conversion, double-check the results for this table field to
make sure that it has been converted correctly. If you find any
inconsistencies or other issues, contact SAP.

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.

CNV_20100242 - Details

• The SAP error message CNV_20100242, which states "Proposed conversion routine cannot be changed for SAP tables," 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 trying to modify a conversion routine for a standard SAP table, which is not allowed.
  
  Cause:
  
  Standard SAP Tables: The error arises because the conversion routine for standard SAP tables is predefined and cannot be altered. This is a safeguard to maintain data integrity and consistency within the SAP system.
  Data Migration Process: During data migration, if the system detects an attempt to change the conversion routine for a standard table, it triggers this error.
  Custom Code or Enhancements: If there are custom enhancements or modifications in the migration process that attempt to change the conversion routine, this can also lead to the error.
  
  
  Solution:
  
  Review Migration Settings: Check the migration settings