How To Fix CL651 - No assignments found for object comparison

CL651 - Overview

• Message type: E = Error

• Message class: CL - Classification

• Message number: 651

• Message text: No assignments found for object comparison

What causes this issue?

The objects you entered are not allocated to the class type or the
class you entered.
Possible reasons for this:
the objects you entered are not classified
the objects you entered are not classified using the classes/class
types entered
you have not entered any objects

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

System Response

The system checks for object allocations.

How to fix this error?

Check your entries.

Error message extract from SAP system. Copyright SAP SE.

CL651 - Details

• The SAP error message CL651 ("No assignments found for object comparison") typically occurs in the context of class or object comparisons in the SAP system, particularly when working with the Class Builder (transaction code SE24) or when performing certain operations related to class definitions and inheritance.
  
  Cause:
  The error message CL651 usually indicates that the system is unable to find any assignments or relationships between the objects you are trying to compare. This can happen due to several reasons, including:
  
  No Inheritance: The classes or objects you are comparing do not have any inheritance relationship or are not related in the way expected.
  Missing Implementations: The classes may not have any methods or attributes defined that can be compared.
  Incorrect Object Types: The objects being compared may not be of the same type or may not be compatible for comparison.
  
  Configuration Issues: There may be issues with the configuration of the classes or the environment that