How To Fix CL668 - Class type &1 does not allow additional objects

CL668 - Overview

• Message type: E = Error

• Message class: CL - Classification

• Message number: 668

• Message text: Class type &1 does not allow additional objects

What causes this issue?

Class type &V1& does not have the <ZH>Multiple objs allowed</>
indicator, so you cannot enter object tables for the class type under
<ZH>Objects</>.

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?

If you want to enter multiple objects for the class type, set the
indicator for the class type first.

Error message extract from SAP system. Copyright SAP SE.

CL668 - Details

• The SAP error message CL668 indicates that you are trying to add additional objects to a class type that does not permit it. This typically occurs when you are working with class types in the ABAP Object-Oriented programming environment, and it can happen in various scenarios, such as when trying to add attributes, methods, or other components to a class that is defined in a way that restricts such modifications.
  
  Cause:
  
  Class Type Restrictions: The class type you are working with may be defined as a final class or an interface that does not allow additional objects to be added.
  Inheritance Issues: If you are trying to extend a class that is not designed to be extended, you may encounter this error.
  System Configuration: Certain system settings or configurations may restrict modifications to specific class types.
  
  
  Solution:
  
  Check Class Definition: Review the class definition to ensure that it is not marked as final or an interface