How To Fix CL747 - Assignment of class "&" to class "&" was not changed

SAP Error Message - Details

• Message type: E = Error

• Message class: CL - Classification

• Message number: 747

• Message text: Assignment of class "&" to class "&" was not changed

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message CL747 - Assignment of class "&" to class "&" was not changed ?

  The SAP error message CL747, which states "Assignment of class '&' to class '&' was not changed," typically occurs in the context of class hierarchies in ABAP Object-Oriented programming. This error indicates that there is an attempt to change the assignment of a class to another class, but the assignment is already in place and does not require any changes.
  Cause:
  
  Redundant Assignment: The most common cause of this error is that the assignment you are trying to make already exists. For example, if you are trying to assign a subclass to a superclass that it is already assigned to, SAP will throw this error.
  Incorrect Class Type: You might be trying to assign a class that is not compatible with the target class (e.g., assigning a final class to a non-final class).
  Authorization Issues: Sometimes, the user may not have the necessary authorizations to make changes to class assignments, leading to this error.
  
  Solution:
  
  Check Existing Assignments: Verify the current class assignments in the Class Builder (transaction code SE24). Ensure that the assignment you are trying to make is not already in place.
  Review Class Hierarchy: Make sure that the class you are trying to assign is compatible with the target class. Check if the class is a subclass of the target class or if it meets the necessary criteria for assignment.
  Authorization Check: Ensure that you have the necessary authorizations to make changes to class assignments. If not, contact your SAP security administrator to obtain the required permissions.
  Use the Correct Method: If you are using a programmatic approach to change class assignments, ensure that you are using the correct methods and syntax as per the ABAP Object-Oriented programming guidelines.
  
  Related Information:
  
  Class Builder (SE24): This transaction allows you to create and manage classes and interfaces in SAP.
  ABAP Documentation: Refer to the official SAP documentation for more details on class hierarchies and object-oriented programming in ABAP.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message, as there may be specific fixes or workarounds provided by SAP.
  
  If the issue persists after checking the above points, consider reaching out to your SAP support team for further assistance.