How To Fix OL592 - Method '&' is already implemented in a super type

SAP Error Message - Details

• Message type: E = Error

• Message class: OL - Workflow object types: Run-time system

• Message number: 592

• Message text: Method '&' is already implemented in a super type

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message OL592 - Method '&' is already implemented in a super type ?

  The SAP error message OL592 indicates that there is an attempt to implement a method in a subclass that has already been implemented in a superclass. This is a common issue when working with inheritance in ABAP Object-Oriented Programming (OOP).
  Cause:
  The error occurs when:
  
  You are trying to redefine a method in a subclass that has already been defined in its superclass.
  The method in the superclass is not declared as REDEFINITION or FINAL, which would allow it to be overridden in subclasses.
  
  Solution:
  To resolve this error, you can take one of the following actions:
  
  
  Remove the Redefinition: If the method in the superclass is sufficient for your needs, you can simply remove the implementation from the subclass.
  
  
  Use the REDEFINITION Keyword: If you need to change the behavior of the method in the subclass, ensure that the method in the superclass is declared with the REDEFINITION keyword. This allows subclasses to provide their own implementation.
  Example:
  CLASS super_class DEFINITION.
    METHODS: my_method.
  ENDCLASS.
  
  CLASS super_class IMPLEMENTATION.
    METHOD my_method.
      " Implementation
    ENDMETHOD.
  ENDCLASS.
  
  CLASS sub_class DEFINITION INHERITING FROM super_class.
    METHODS: my_method REDEFINITION.
  ENDCLASS.
  
  CLASS sub_class IMPLEMENTATION.
    METHOD my_method.
      " New implementation
    ENDMETHOD.
  ENDCLASS.
  
  
  Check for FINAL Keyword: If the method in the superclass is declared as FINAL, it cannot be overridden in any subclass. In this case, you will need to either change the design or use a different method name in the subclass.
  
  
  Review Class Hierarchy: Ensure that you are aware of the class hierarchy and the methods defined in each class. This will help you avoid conflicts and understand where methods are inherited from.
  
  
  Related Information:
  
  ABAP Documentation: Refer to the official SAP documentation for more details on class definitions, method implementations, and inheritance in ABAP.
  Debugging: Use the ABAP debugger to trace the class hierarchy and method calls to understand where the conflict arises.
  Best Practices: Follow best practices for OOP in ABAP, such as clear naming conventions and proper use of inheritance, to minimize such issues.
  
  By following these steps, you should be able to resolve the OL592 error and implement your methods correctly in the class hierarchy.