How To Fix OL594 - Attribute '&' 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: 594

• Message text: Attribute '&' 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 OL594 - Attribute '&' is already implemented in a super type ?

  The SAP error message OL594, which states "Attribute '&' is already implemented in a super type," typically occurs in the context of Object-Oriented Programming (OOP) in ABAP when you are trying to define an attribute in a subclass that has already been defined in its superclass. This is a violation of the inheritance principles in OOP, where a subclass cannot redefine an attribute that is already defined in its superclass.
  Cause:
  
  Duplicate Attribute Definition: You are attempting to declare an attribute in a subclass that has already been declared in the superclass.
  Inheritance Structure: The class hierarchy is set up in such a way that the subclass is trying to implement an attribute that is already inherited from the superclass.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Remove the Duplicate Declaration: Check the subclass where the error is occurring and remove the attribute declaration that is already defined in the superclass. You should only declare the attribute in the superclass.
  
  
  Use the Superclass Attribute: If you need to use the attribute in the subclass, you can directly access it without redeclaring it. You can use the inherited attribute as is.
  
  
  Check Class Definitions: Review the class definitions to ensure that the inheritance structure is correctly set up and that attributes are not being unnecessarily duplicated.
  
  
  Refactor if Necessary: If you find that the design requires different attributes in the subclass, consider refactoring the class hierarchy. You might need to rethink the design to avoid such conflicts.
  
  
  Related Information:
  
  Object-Oriented Programming in ABAP: Understanding the principles of OOP, such as inheritance, encapsulation, and polymorphism, is crucial for working with classes and objects in ABAP.
  Class and Interface Documentation: Refer to the SAP documentation for classes and interfaces to understand how attributes and methods are inherited and overridden.
  ABAP Development Tools: Use the ABAP Development Tools (ADT) in Eclipse or the SAP GUI to navigate class definitions and check for attribute declarations.
  
  By following these steps, you should be able to resolve the OL594 error and ensure that your class definitions adhere to the principles of OOP in ABAP.