How To Fix CL784 - Assignment of class & to class & must not occur more than once

SAP Error Message - Details

• Message type: E = Error

• Message class: CL - Classification

• Message number: 784

• Message text: Assignment of class & to class & must not occur more than once

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message CL784 - Assignment of class & to class & must not occur more than once ?

  The SAP error message CL784, which states "Assignment of class & to class & must not occur more than once," typically occurs in the context of class hierarchies in the SAP system, particularly when dealing with Object-Oriented Programming (OOP) in ABAP or when managing class definitions in the SAP Business Object Model.
  Cause:
  This error arises when there is an attempt to assign a class to another class more than once in the class hierarchy. In SAP, each class can only be assigned to another class (as a subclass) once. If you try to create a duplicate assignment, the system will throw this error to prevent inconsistencies in the class structure.
  Solution:
  To resolve this error, you can follow these steps:
  
  
  Check Class Assignments: Review the class assignments in the Class Builder (transaction code SE24). Look for the class that is causing the issue and check its superclass assignments.
  
  
  Remove Duplicate Assignments: If you find that the same class is assigned multiple times as a superclass, remove the duplicate assignment. You can do this by selecting the duplicate entry and deleting it.
  
  
  Recheck Class Hierarchy: Ensure that the class hierarchy is correctly structured and that no other classes are incorrectly assigned.
  
  
  Activate Changes: After making the necessary changes, activate the class to ensure that the changes take effect.
  
  
  Test the Changes: After activation, test the functionality that was causing the error to ensure that the issue has been resolved.
  
  
  Related Information:
  
  Class Builder (SE24): This is the transaction code used to create and manage classes in SAP. You can use it to view and modify class definitions and their relationships.
  Class Hierarchy: Understanding the class hierarchy is crucial in OOP. Each class can inherit properties and methods from its superclass, and maintaining a clear hierarchy is essential for proper functionality.
  Documentation: Refer to SAP documentation or help resources for more information on class definitions and OOP principles in ABAP.
  
  If the problem persists after following these steps, consider consulting with a colleague or reaching out to SAP support for further assistance.