How To Fix CME_DTYPE030 - You cannot change the conversion method

CME_DTYPE030 - Overview

• Message type: E = Error

• Message class: CME_DTYPE - CME Data Type: Checks

• Message number: 030

• Message text: You cannot change the conversion method

What causes this issue?

The data type has versions - higher versions must remain compatible
with lower versions.

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 CME_DTYPE030 - You cannot change the conversion method ?

  The SAP error message CME_DTYPE030, which states "You cannot change the conversion method," typically occurs in the context of data type conversion in SAP, particularly when dealing with data elements or fields in the ABAP Dictionary. This error indicates that the conversion method for a particular data type cannot be modified due to certain constraints.
  
  Cause:
  
  Fixed Conversion Method: The data type or field you are trying to modify has a fixed conversion method that is defined in the ABAP Dictionary. This is often the case for standard data types or fields that are part of a standard SAP application.
  Inconsistent Data Model: If the data type is being used in multiple places (like in tables, structures, or function modules), changing the conversion method could lead to inconsistencies in the data model.
  Authorization Issues: Sometimes, the user may not have the necessary authorizations to make changes to the data type or its conversion method.
  
  
  Solution:
  
  Check