How To Fix CL127 - Assignment of & to class &, class type &, already exists

SAP Error Message - Details

• Message type: E = Error

• Message class: CL - Classification

• Message number: 127

• Message text: Assignment of & to class &, class type &, already exists

What causes this issue?

The allocation you entered already exists and cannot be created twice.

System Response

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

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CL127 - Assignment of & to class &, class type &, already exists ?

  The SAP error message CL127 indicates that there is an attempt to assign a class to another class or class type that has already been assigned. This typically occurs in the context of Object-Oriented Programming in ABAP when dealing with class definitions and inheritance.
  Cause:
  The error occurs due to one of the following reasons:
  
  Duplicate Assignment: You are trying to assign a class to a class type or another class that has already been assigned to it.
  Incorrect Class Definition: There may be an issue with the way classes are defined or structured, leading to conflicts in assignments.
  Namespace Conflicts: If you are working in a system with multiple namespaces, there might be a conflict with class names or types.
  
  Solution:
  To resolve the CL127 error, you can take the following steps:
  
  
  Check Class Assignments:
  
  Review the class definitions and ensure that you are not trying to assign the same class to a class type or another class more than once.
  Use transaction code SE24 (Class Builder) to check the class definitions and their relationships.
  
  
  
  Modify Class Structure:
  
  If you find that a class is being assigned multiple times, consider restructuring your class hierarchy to avoid duplicate assignments.
  Ensure that the inheritance structure is clear and does not lead to circular references.
  
  
  
  Namespace Management:
  
  If you suspect namespace conflicts, ensure that the class names are unique and do not conflict with other classes in the system.
  Use proper naming conventions to avoid confusion.
  
  
  
  Check for Transport Issues:
  
  If this error occurs after a transport request, ensure that all related objects have been transported correctly and are in sync.
  
  
  
  Debugging:
  
  If the issue persists, you may need to debug the program or class where the error occurs to identify the exact point of failure.
  
  
  
  Related Information:
  
  Transaction Codes: SE24 (Class Builder), SE80 (Object Navigator), SE11 (Data Dictionary).
  Documentation: Refer to SAP Help documentation for Object-Oriented ABAP programming for more insights on class definitions and inheritance.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  
  By following these steps, you should be able to identify and resolve the cause of the CL127 error in your SAP system.