How To Fix OO181 - Class &1 is already a superclass of &2

SAP Error Message - Details

• Message type: E = Error

• Message class: OO - Class Builder/API

• Message number: 181

• Message text: Class &1 is already a superclass of &2

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.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message OO181 - Class &1 is already a superclass of &2 ?

  The SAP error message OO181 indicates that there is an issue with class inheritance in the ABAP Object-Oriented programming environment. Specifically, the error message states that the class you are trying to define as a subclass (or child class) is already a superclass (or parent class) of the class you are trying to define as a superclass. This creates a circular reference or an invalid inheritance hierarchy.
  Cause:
  The error occurs when:
  
  You attempt to create a subclass that is already a superclass of another class.
  There is a misconfiguration in the class hierarchy, leading to a situation where the system cannot resolve the inheritance correctly.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check Class Hierarchy: Review the class definitions and their relationships. Ensure that the class you are trying to define as a subclass is not already defined as a superclass of the class you are trying to define as a superclass.
  
  
  Modify Class Definitions: If you find that the class hierarchy is incorrect, you may need to modify the class definitions. This could involve:
  
  Changing the superclass of the subclass.
  Removing or altering the inheritance relationship to avoid circular references.
  
  
  
  Recompile Classes: After making changes to the class definitions, recompile the classes to ensure that the changes take effect.
  
  
  Check for Dependencies: Ensure that there are no other classes or programs that depend on the classes you are modifying, as this could lead to further issues.
  
  
  Use Transaction SE80: You can use the Object Navigator (transaction SE80) to visually inspect the class hierarchy and make necessary adjustments.
  
  
  Related Information:
  
  ABAP Documentation: Refer to the official SAP documentation for more details on class definitions and inheritance in ABAP.
  SAP Community: You can search for similar issues in the SAP Community forums, where other developers may have encountered and resolved similar problems.
  Debugging Tools: Utilize debugging tools in the ABAP Workbench to trace the class instantiation and identify where the error is occurring.
  
  By following these steps, you should be able to resolve the OO181 error and correctly configure your class hierarchy in SAP.