How To Fix DBOSC520 - Error while calling method; method '&1' must be implemented in subclass

SAP Error Message - Details

• Message type: E = Error

• Message class: DBOSC -

• Message number: 520

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

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message DBOSC520 - Error while calling method; method '&1' must be implemented in subclass ?

  The SAP error message DBOSC520 indicates that there is an issue with a method that is expected to be implemented in a subclass but is not found. This typically occurs in the context of Object-Oriented Programming (OOP) in ABAP, where a method is defined in a superclass but is expected to be overridden in a subclass.
  Cause:
  
  Missing Implementation: The subclass that is supposed to implement the method has not provided an implementation for the method specified in the error message.
  Incorrect Class Hierarchy: The subclass may not be correctly inheriting from the superclass where the method is defined.
  Method Signature Mismatch: The method in the subclass may have a different signature (parameters, return type) than what is defined in the superclass.
  Abstract Method: If the method in the superclass is declared as abstract, it must be implemented in any concrete subclass.
  
  Solution:
  
  Implement the Method: Go to the subclass that is mentioned in the error message and implement the required method. Ensure that the method signature matches that of the superclass.
  Check Class Hierarchy: Verify that the subclass is correctly inheriting from the superclass. You can do this by checking the class definition in the ABAP Workbench (SE80 or SE24).
  Review Method Signature: Ensure that the method in the subclass has the same parameters and return type as defined in the superclass.
  Use Abstract Classes Correctly: If the superclass method is abstract, ensure that the subclass is a concrete class and implements the method.
  Activate Changes: After making the necessary changes, activate the class to ensure that the implementation is recognized by the system.
  
  Related Information:
  
  ABAP Class Definition: You can view and edit class definitions using transaction SE24 (Class Builder).
  Debugging: If you are unsure where the error is occurring, you can use the ABAP debugger to trace the execution and identify where the method call fails.
  Documentation: Review the documentation for the superclass to understand the purpose of the method and any specific requirements for its implementation.
  SAP Notes: Check SAP Notes for any known issues or additional guidance related to this error message.
  
  By following these steps, you should be able to resolve the DBOSC520 error and ensure that your subclass correctly implements the required method.