How To Fix /PF1/MSG_BPE028 - Class should be subclass of class /PF1/CL_PO_E_EV_CHECK up to 2 levels

SAP Error Message - Details

• Message type: E = Error

• Message class: /PF1/MSG_BPE -

• Message number: 028

• Message text: Class should be subclass of class /PF1/CL_PO_E_EV_CHECK up to 2 levels

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /PF1/MSG_BPE028 - Class should be subclass of class /PF1/CL_PO_E_EV_CHECK up to 2 levels ?

  The SAP error message /PF1/MSG_BPE028 indicates that there is an issue with class inheritance in the context of Business Process Engine (BPE) or a related framework. Specifically, it suggests that a class you are trying to use is not a subclass of the required class /PF1/CL_PO_E_EV_CHECK up to 2 levels deep.
  Cause:
  
  
  Class Hierarchy Violation: The class you are trying to use does not extend the required base class /PF1/CL_PO_E_EV_CHECK. This could be due to:
  
  The class being incorrectly defined.
  A missing or incorrect implementation of the required methods.
  The class being created in a way that does not adhere to the expected inheritance structure.
  
  
  
  Configuration Issues: There may be configuration settings in the BPE or related components that are expecting a specific class structure that is not being met.
  
  
  Development Errors: If custom classes were developed, they may not have been implemented correctly, leading to this error.
  
  
  Solution:
  
  
  Check Class Definition: Verify that the class you are using is indeed a subclass of /PF1/CL_PO_E_EV_CHECK. You can do this by:
  
  Navigating to the class in the ABAP Workbench (SE80 or SE24).
  Checking the inheritance structure to ensure it extends the required class.
  
  
  
  Modify Class: If the class is not a subclass, you will need to modify it to extend the required class. This can be done by:
  
  Changing the class definition to inherit from /PF1/CL_PO_E_EV_CHECK.
  Implementing any required methods that are expected by the base class.
  
  
  
  Review Documentation: Check any relevant documentation or guidelines provided for the BPE or the specific implementation you are working with. This may provide insights into the expected class structure.
  
  
  Testing: After making changes, test the functionality to ensure that the error is resolved and that the system behaves as expected.
  
  
  Consult SAP Notes: Look for any SAP Notes related to this error message or the classes involved. There may be known issues or patches that can help resolve the problem.
  
  
  Related Information:
  
  ABAP Class Hierarchy: Understanding how class inheritance works in ABAP is crucial. Familiarize yourself with the concepts of superclass and subclass, and how to implement methods in subclasses.
  Business Process Engine (BPE): If you are working with BPE, ensure you understand its architecture and how classes interact within that framework.
  SAP Community: Consider reaching out to the SAP Community or forums for additional insights or similar experiences from other users.
  
  By following these steps, you should be able to identify the root cause of the error and implement a solution to resolve it.