How To Fix OO630 - The class & cannot be used as a superclass

SAP Error Message - Details

• Message type: E = Error

• Message class: OO - Class Builder/API

• Message number: 630

• Message text: The class & cannot be used as a superclass

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 OO630 - The class & cannot be used as a superclass ?

  The SAP error message OO630, which states "The class & cannot be used as a superclass," typically occurs in the context of ABAP Object-Oriented programming when there is an issue with class inheritance. Here are the common causes, solutions, and related information for this error:
  Causes:
  
  Non-Abstract Class: The class you are trying to use as a superclass is not defined as an abstract class, and it may not be suitable for inheritance.
  Final Class: The class you are trying to inherit from is marked as FINAL, which means it cannot be subclassed.
  Incorrect Visibility: The class or its methods may not have the appropriate visibility (e.g., PUBLIC, PROTECTED) that allows it to be inherited.
  Circular Inheritance: There may be a circular reference in the class hierarchy that prevents the class from being used as a superclass.
  Interface vs. Class: You might be trying to use an interface as a superclass, which is not allowed in the same way as a class.
  
  Solutions:
  
  Check Class Definition: Ensure that the class you are trying to use as a superclass is not marked as FINAL and is defined correctly.
  Use Abstract Classes: If the superclass is intended to be abstract, ensure it is defined as such using the ABSTRACT keyword.
  Visibility Modifiers: Verify that the visibility of the class and its methods is appropriate for inheritance. Use PUBLIC or PROTECTED as needed.
  Review Inheritance Structure: Check the class hierarchy for any circular references or incorrect relationships that might be causing the issue.
  Correct Class Type: Ensure that you are not mistakenly trying to inherit from an interface when you need a class.
  
  Related Information:
  
  ABAP Documentation: Refer to the official SAP documentation for more details on class definitions, inheritance, and object-oriented programming in ABAP.
  SE80 / SE24: Use transaction codes SE80 (Object Navigator) or SE24 (Class Builder) to inspect the class definitions and their properties.
  Debugging: If the error persists, consider debugging the code to trace where the inheritance is being defined and identify the exact cause of the error.
  
  By addressing the above points, you should be able to resolve the OO630 error and successfully implement your class inheritance in ABAP.