How To Fix DT142 - & &: Type and length must not be changed

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 142

• Message text: & &: Type and length must not be changed

What causes this issue?

You have changed the data type or the length for a field. In support
package systems, this is not allowed.

System Response

The table will not be activated.

How to fix this error?

Remove the change.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message DT142 - & &: Type and length must not be changed ?

  The SAP error message DT142, which states "Type and length must not be changed," typically occurs when there is an attempt to modify the data type or length of a field in a structure or table that is already in use. This can happen in various scenarios, such as when you are trying to change the definition of a database table, a structure, or a data element that is already being referenced in other objects (like programs, function modules, or other database tables).
  Causes:
  
  Modification of Existing Data Elements: Attempting to change the type or length of a data element that is already used in other structures or tables.
  Inconsistent Definitions: If a field in a structure or table is being used in multiple places, changing its definition in one place can lead to inconsistencies.
  Transport Requests: If you are trying to transport changes that include modifications to data types or lengths, and those changes conflict with existing definitions in the target system.
  
  Solutions:
  
  Avoid Changing Existing Definitions: If possible, avoid changing the type or length of existing fields. Instead, consider creating a new data element or field with the desired properties.
  Check Dependencies: Before making changes, check where the data element or field is being used. You can use transaction SE11 (Data Dictionary) to analyze the usage of the data element or field.
  Create a New Field: If you need to change the type or length, create a new field with the desired properties and update the relevant programs or structures to use the new field.
  Use a Transport Request: If you are working in a development environment, ensure that your changes are properly included in a transport request and that the transport is correctly managed to avoid conflicts.
  Consult Documentation: Review SAP documentation or consult with your SAP Basis or ABAP team for best practices regarding changes to data types and lengths.
  
  Related Information:
  
  Transaction Codes: Use SE11 (Data Dictionary) to view and modify data elements, tables, and structures.
  ABAP Development: If you are an ABAP developer, ensure that you follow best practices for data definitions and understand the implications of changing data types.
  SAP Notes: Check SAP Notes for any specific guidance or known issues related to this error message. You can search for DT142 in the SAP Support Portal.
  
  By following these guidelines, you should be able to address the DT142 error effectively.