How To Fix OO004 - Class &1 has an invalid multiple inheritance

OO004 - Overview

• Message type: E = Error

• Message class: OO - Class Builder/API

• Message number: 004

• Message text: Class &1 has an invalid multiple inheritance

What causes this issue?

More than one inheritance relationship is defined for class &1. The
class can no longer be edited.

How to fix this error?

Run a clean-up for the data.

Error message extract from SAP system. Copyright SAP SE.

OO004 - Details

• The SAP error message OO004, which states "Class &1 has an invalid multiple inheritance," typically occurs in the context of ABAP Object-Oriented programming when there is an issue with the inheritance structure of classes. This error indicates that the class in question is attempting to inherit from multiple classes in a way that is not allowed by the rules of the ABAP Object-Oriented programming model.
  
  Cause:
  
  Multiple Inheritance: ABAP does not support multiple inheritance in the same way that some other object-oriented languages do. If a class tries to inherit from more than one superclass that has a common ancestor, it can lead to ambiguity and conflicts.
  Circular References: If the inheritance structure creates a circular reference, it can also trigger this error.
  Incorrect Class Definition: The class might be defined incorrectly, or there may be a misconfiguration in the class hierarchy.
  
  
  Solution:
  
  Review Class Hierarchy: Check the inheritance structure of the class that is causing