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

DT142 - Overview

• 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.

DT142 - Details

• 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