How To Fix DT902 - &-structure: invalid change: data type of field & changed

SAP Error Message - Details

• Message type: E = Error

• Message class: DT - Table activation (incl. indexes)

• Message number: 902

• Message text: &-structure: invalid change: data type of field & changed

What causes this issue?

For a BAPI or an IDOC structure, you have attempted to change a field
type. The structure, however, is marked as "frozen". This means that, in
this version, it is delivered productive in BAPIs and IDOCs,
respectively. A new delivery with the executed change would contradict
the agreed interface.

System Response

Activation is rejected.

How to fix this error?

Take back the change. If it is absolutely necessary, you will then have
to remove the "frozen" status. For information on how to do this and
what you need to watch out for, refer to Note 1297242.

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 DT902 - &-structure: invalid change: data type of field & changed ?

  The SAP error message DT902, which states "Structure: Invalid change: Data type of field & changed," typically occurs when there is an attempt to modify the data type of a field in a structure that is already being used in various places within the SAP system. This can happen during the development of ABAP programs, enhancements, or when modifying data dictionary objects.
  Cause:
  
  Data Type Change: The primary cause of this error is that the data type of a field in a structure is being changed after it has already been defined and used in other objects (like tables, views, or programs).
  Dependencies: SAP structures are often used in multiple places, and changing the data type can lead to inconsistencies or errors in those dependent objects.
  Transport Requests: If the change is being made in a transport request, it may conflict with existing objects that rely on the original data type.
  
  Solution:
  
  Avoid Changing Data Types: The best practice is to avoid changing the data type of fields in structures that are already in use. Instead, consider creating a new field or a new structure if a change is necessary.
  Check Dependencies: Before making changes, check all dependencies of the structure. You can use transaction SE11 (Data Dictionary) to analyze where the structure is used.
  Use a New Structure: If a change is necessary, create a new structure with the desired data type and update the dependent objects to use the new structure.
  Transport Management: If the change is part of a transport request, ensure that all dependent objects are also included in the transport to avoid inconsistencies.
  Consult Documentation: Review SAP documentation or consult with your SAP Basis or ABAP team for best practices regarding changes to data dictionary objects.
  
  Related Information:
  
  Transaction Codes: Use SE11 (Data Dictionary) to view and modify structures, and SE80 (Object Navigator) to see where the structure is used.
  ABAP Development Guidelines: Follow SAP's ABAP development guidelines to ensure that changes to data types and structures are handled correctly.
  Version Control: Maintain version control of your development objects to track changes and avoid conflicts.
  
  If you continue to face issues or if the changes are critical, consider reaching out to SAP support or your internal SAP team for further assistance.