How To Fix PMMO_BASIS008 - System could not verify that class &1 is a subclass of &2

SAP Error Message - Details

• Message type: E = Error

• Message class: PMMO_BASIS - Messages for PMMO Basis Objects

• Message number: 008

• Message text: System could not verify that class &1 is a subclass of &2

What causes this issue?

Either you are replacing a local class, or you are specifying a subclass
with an unexpectedly deep class hierarchy.

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?

In either case, please verify for yourself that your class really is a
subclass of the class being replaced. Otherwise, users will encounter
runtime errors.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message PMMO_BASIS008 - System could not verify that class &1 is a subclass of &2 ?

  The SAP error message PMMO_BASIS008 indicates that the system could not verify that a specified class is a subclass of another class. This typically occurs in the context of Object-Oriented Programming in ABAP, where class inheritance is a fundamental concept.
  Cause:
  
  
  Class Definition Issues: The class specified in the error message (&1) may not be correctly defined as a subclass of the class (&2) it is supposed to inherit from. This could be due to:
  
  The subclass not being properly declared in the class definition.
  The superclass not being activated or not existing in the system.
  Typographical errors in the class names.
  
  
  
  Namespace Issues: If the classes are in different namespaces, there might be issues with visibility or access rights.
  
  
  Transport Issues: If the classes were recently transported from another system, there might be inconsistencies or missing dependencies.
  
  
  Activation Issues: The class might not be activated properly in the system.
  
  
  Solution:
  
  
  Check Class Definitions:
  
  Go to the Class Builder (Transaction SE24) and check the definition of both the subclass and the superclass.
  Ensure that the subclass is correctly defined to inherit from the superclass.
  
  
  
  Activate Classes:
  
  Make sure both the superclass and subclass are activated. You can do this in the Class Builder by selecting the class and choosing the "Activate" option.
  
  
  
  Check for Typos:
  
  Verify that there are no typographical errors in the class names in your code.
  
  
  
  Namespace Verification:
  
  Ensure that both classes are in the correct namespaces and that there are no access restrictions.
  
  
  
  Transport Consistency:
  
  If the classes were transported, check the transport logs for any errors and ensure that all dependencies are included in the transport.
  
  
  
  Debugging:
  
  If the issue persists, consider debugging the code where the error occurs to get more context on what might be causing the problem.
  
  
  
  Related Information:
  
  ABAP Documentation: Review the official SAP documentation on Object-Oriented Programming in ABAP for more details on class definitions and inheritance.
  SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that might address this specific error or provide additional troubleshooting steps.
  Community Forums: Consider searching or posting on SAP community forums (like SAP Community or Stack Overflow) for insights from other developers who may have encountered similar issues.
  
  By following these steps, you should be able to identify and resolve the cause of the PMMO_BASIS008 error in your SAP system.