How To Fix CME_DTYPE020 - You cannot change the data type

CME_DTYPE020 - Overview

• Message type: E = Error

• Message class: CME_DTYPE - CME Data Type: Checks

• Message number: 020

• Message text: You cannot change the data type

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_DTYPE020 - You cannot change the data type ?

  The SAP error message CME_DTYPE020, which states "You cannot change the data type," typically occurs when you attempt to modify the data type of a field in a database table or structure that is not allowed due to various constraints. This error is often encountered in the context of ABAP Dictionary (SE11) or when working with data elements and domains.
  Causes:
  
  Existing Data: If there is existing data in the database table that is incompatible with the new data type, SAP will prevent the change to avoid data loss or corruption.
  Dependencies: The field may be used in other database objects, such as views, indexes, or foreign key relationships, which restricts changes to its data type.
  Data Element Restrictions: If the field is based on a data element that has been defined with specific attributes, changing the data type may violate those definitions.
  Transport Requests: If the object is part of a transport request that