How To Fix CL606 - Class type &: class & has no superior class

CL606 - Overview

• Message type: E = Error

• Message class: CL - Classification

• Message number: 606

• Message text: Class type &: class & has no superior class

What causes this issue?

You have requested a class hierarchy. However, class &V2& of class type
&V1& has no superior classes.
The hierarchy cannot therefore be exploded.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Error message extract from SAP system. Copyright SAP SE.

CL606 - Details

• The SAP error message CL606 indicates that there is an issue with the class hierarchy in the ABAP Object-Oriented programming environment. Specifically, the error message states that the class you are trying to define or use does not have a valid superior class, which is necessary for the class to inherit properties and methods.
  
  Cause:
  
  Missing Superior Class: The class you are trying to create or reference is defined with a superior class that does not exist or is not accessible in the current context.
  Incorrect Class Type: The class type specified might be incorrect. For example, you might be trying to define a subclass of a class that is not a valid superclass.
  Typographical Errors: There could be a typo in the name of the superior class, leading to the system not being able to find it.
  Visibility Issues: The superior class might be defined in a different package or namespace that is not