How To Fix CL651 - No assignments found for object comparison

SAP Error Message - Details

• 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.

Smart SAP Assistant

• What is the cause and solution for SAP error message CL651 - No assignments found for object comparison ?

  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 prevent the system from recognizing the relationships.
  
  Solution:
  To resolve the CL651 error, you can take the following steps:
  
  
  Check Class Relationships: Verify that the classes or objects you are trying to compare have the appropriate inheritance or relationship. You can do this by checking the class hierarchy in the Class Builder (SE24).
  
  
  Review Class Definitions: Ensure that the classes have the necessary methods and attributes defined. If they are abstract classes or interfaces, make sure that there are concrete implementations available.
  
  
  Validate Object Types: Confirm that the objects you are comparing are of the same type and are compatible for comparison. If they are not, you may need to adjust your comparison logic.
  
  
  Debugging: If you are working with custom code, consider debugging the program to see where the comparison is failing. This can provide insights into why the assignments are not found.
  
  
  Consult Documentation: Review SAP documentation or help resources related to class comparisons and object-oriented programming in ABAP to ensure you are following the correct procedures.
  
  
  Check for Updates: Ensure that your SAP system is up to date with the latest patches and updates, as sometimes bugs can be resolved in newer versions.
  
  
  Related Information:
  
  Transaction Codes: SE24 (Class Builder), SE80 (Object Navigator), SE11 (Data Dictionary).
  SAP Notes: Check SAP Notes for any known issues related to this error message. You can search for CL651 in the SAP Support Portal.
  ABAP Documentation: Review the ABAP programming guidelines for object-oriented programming to ensure best practices are being followed.
  
  If the issue persists after trying the above solutions, consider reaching out to your SAP support team or consulting with an SAP expert for further assistance.