How To Fix OL720 - The object type already supports attribute '&1' from another interface

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 720

• Message text: The object type already supports attribute '&1' from another interface

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.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message OL720 - The object type already supports attribute '&1' from another interface ?

  The SAP error message OL720 indicates that there is an issue with the definition of an object type in the context of Object-Oriented Programming (OOP) in ABAP. Specifically, it means that the object type you are trying to define already has an attribute that is being inherited from another interface. This can occur when you are trying to define an attribute in a class that is already defined in one of its parent classes or interfaces.
  Cause:
  
  Duplicate Attribute Definition: The attribute you are trying to define in your class is already defined in a superclass or an interface that the class implements.
  Inheritance Conflicts: If your class inherits from multiple interfaces or classes that define the same attribute, this error can occur.
  
  Solution:
  To resolve the OL720 error, you can take the following steps:
  
  
  Check Existing Definitions: Review the attributes defined in the parent classes and interfaces that your class is inheriting from. Ensure that you are not trying to redefine an attribute that already exists.
  
  
  Remove Duplicate Definition: If you find that the attribute is already defined in a parent class or interface, you should remove the duplicate definition from your class.
  
  
  Use the Existing Attribute: Instead of defining a new attribute, use the existing one from the parent class or interface. This will help maintain consistency and avoid redundancy.
  
  
  Refactor Code: If necessary, refactor your code to ensure that the design adheres to the principles of inheritance and encapsulation. This may involve redesigning your class structure to avoid conflicts.
  
  
  Related Information:
  
  Object-Oriented Programming in ABAP: Understanding the principles of OOP in ABAP, including inheritance, interfaces, and encapsulation, can help prevent such errors.
  SAP Documentation: Refer to the official SAP documentation for more details on class and interface definitions, as well as best practices for OOP in ABAP.
  Debugging Tools: Use the ABAP Workbench tools to analyze the class hierarchy and see where the attribute is defined.
  
  By following these steps, you should be able to resolve the OL720 error and ensure that your class definitions are correct and conflict-free.