How To Fix BSP_WD028 - Redefinition of method GET_MAIN_ENTITY is missing in controller class &1

BSP_WD028 - Overview

• Message type: E = Error

• Message class: BSP_WD -

• Message number: 028

• Message text: Redefinition of method GET_MAIN_ENTITY is missing in controller class &1

What causes this issue?

Redefinition of method IF_BSP_WD_HISTORY_STATE_DESCR~GET_MAIN_ENTITY()
is missing in
the reported controller class &V1&.

System Response

Method IF_BSP_WD_HISTORY_STATE_DESCR~GET_MAIN_ENTITY() for base class
CL_BSP_WD_VIEW_CONTROLLER was not redefined as expected.
The interface is also used by extensibility tools to provide correct
object embedding. One should
select for the appropriate main entity, if known.

How to fix this error?

Inform the responsible application developer.

Procedure for System Administrators

Redefine the method IF_BSP_WD_HISTORY_STATE_DESCR~GET_MAIN_ENTITY() in
class &V1&.

Error message extract from SAP system. Copyright SAP SE.

BSP_WD028 - Details

• The SAP error message BSP_WD028 indicates that there is a problem with the method GET_MAIN_ENTITY in a Web Dynpro ABAP application. Specifically, it suggests that the method is expected to be redefined in the controller class, but it is missing. This typically occurs when you are working with a component that is based on a parent component or when you are trying to override a method in a subclass.
  
  Cause:
  
  Inheritance Issue: The method GET_MAIN_ENTITY is defined in a parent class or interface, and the subclass (your controller class) is expected to provide its own implementation of this method.
  Missing Implementation: The method has not been implemented in the subclass, which leads to this error when the framework tries to call it.
  Incorrect Class Assignment: The controller class may not be correctly assigned or may not be extending the correct parent class.
  
  
  Solution:
  
  
  Implement the Method: 
  
  Open the controller class that is generating the error.
  Check if