How To Fix /IWXBE/CORE019 - Class '&1' cannot be used; derive an own sub-class

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWXBE/CORE -

• Message number: 019

• Message text: Class '&1' cannot be used; derive an own sub-class

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 /IWXBE/CORE019 - Class '&1' cannot be used; derive an own sub-class ?

  The SAP error message /IWXBE/CORE019 Class '&1' cannot be used; derive an own sub-class typically occurs in the context of the SAP Business Workflow or Business Object Processing Framework (BOPF). This error indicates that the specified class cannot be used directly and that you need to create a subclass to extend its functionality.
  Cause:
  
  Abstract Class: The class you are trying to use is likely an abstract class or a base class that is not intended to be instantiated directly. In object-oriented programming, abstract classes are designed to be subclassed and cannot be instantiated on their own.
  Framework Restrictions: The framework may impose restrictions on the use of certain classes to ensure that specific business logic or behaviors are implemented correctly through subclasses.
  Missing Implementation: The class may lack the necessary implementations for certain methods or properties that are required for your specific use case.
  
  Solution:
  
  
  Create a Subclass:
  
  Go to the Class Builder (transaction SE24).
  Enter the name of the class that is causing the error.
  Create a new subclass that inherits from the problematic class.
  Implement the necessary methods and properties in your subclass to meet your requirements.
  
  
  
  Implement Required Methods: Ensure that you implement all the required methods that are expected by the framework or the calling program. This may involve overriding methods from the base class.
  
  
  Check Documentation: Review the SAP documentation for the class you are trying to use. It may provide insights into how to properly extend the class and what methods need to be implemented.
  
  
  Testing: After creating the subclass and implementing the necessary logic, test your implementation to ensure that it behaves as expected and resolves the error.
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or additional guidance related to the specific class you are working with.
  SAP Community: Engage with the SAP Community forums to see if others have encountered similar issues and what solutions they have found.
  Object-Oriented Programming Concepts: Familiarize yourself with object-oriented programming principles, especially inheritance and polymorphism, as they are crucial for working with classes and subclasses in SAP.
  
  By following these steps, you should be able to resolve the error and successfully implement the desired functionality in your SAP environment.