How To Fix /STMC/CR_MSG520 - Error while calling method; method '&1' must be implemented in subclass

SAP Error Message - Details

• Message type: E = Error

• Message class: /STMC/CR_MSG -

• Message number: 520

• Message text: Error while calling method; method '&1' must be implemented in subclass

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 /STMC/CR_MSG520 - Error while calling method; method '&1' must be implemented in subclass ?

  The SAP error message /STMC/CR_MSG520 indicates that a method that is expected to be implemented in a subclass has not been implemented. This is a common issue in object-oriented programming within SAP, particularly when dealing with Business Object (BO) classes or other ABAP classes that utilize inheritance.
  Cause:
  
  Abstract Method: The method that is being called is defined as an abstract method in a superclass. Abstract methods must be implemented in any subclass that is instantiated.
  Missing Implementation: The subclass that is being used does not have an implementation for the specified method.
  Incorrect Class Usage: The instance of the class being used may not be the correct subclass that implements the required method.
  
  Solution:
  
  
  Implement the Method: Check the subclass that is supposed to implement the method. You need to provide an implementation for the method in the subclass. This can be done by:
  
  Navigating to the subclass in the ABAP Workbench (SE80 or SE24).
  Adding the method implementation in the method editor.
  
  
  
  Check Class Hierarchy: Ensure that you are using the correct subclass. You can check the class hierarchy to confirm that the subclass you are using is indeed the one that should implement the method.
  
  
  Review Documentation: If you are unsure about what the method should do, refer to the documentation or comments in the superclass or related classes. This can provide insights into the expected behavior of the method.
  
  
  Debugging: If the error persists, you can use the ABAP debugger to trace the execution and see where the method call is failing. This can help you identify if the correct class is being instantiated.
  
  
  Consult SAP Notes: Sometimes, specific issues may be documented in SAP Notes. Check the SAP Support Portal for any relevant notes that might address this error.
  
  
  Related Information:
  
  ABAP Classes and Inheritance: Understanding how ABAP handles classes and inheritance is crucial. Familiarize yourself with the concepts of abstract classes and methods in ABAP.
  SE80/SE24: Use transaction codes SE80 (Object Navigator) or SE24 (Class Builder) to navigate and edit classes.
  SAP Community: If you are still having trouble, consider reaching out to the SAP Community or forums for additional support and insights from other developers who may have encountered similar issues.
  
  By following these steps, you should be able to resolve the error and ensure that the method is properly implemented in the subclass.