How To Fix OO649 - Interface & has already been implemented

SAP Error Message - Details

• Message type: E = Error

• Message class: OO - Class Builder/API

• Message number: 649

• Message text: Interface & has already been implemented

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 OO649 - Interface & has already been implemented ?

  The SAP error message OO649 indicates that an interface has already been implemented in the system. This typically occurs when you attempt to implement an interface that has already been defined in the system, either in the same class or in a different class.
  Cause:
  
  Duplicate Implementation: The interface you are trying to implement has already been implemented in the class or in a superclass.
  Incorrect Class Definition: The class definition may not be correctly set up to allow for the implementation of the interface.
  Multiple Inheritance: In some cases, if you are using multiple inheritance (through interfaces), you might run into conflicts if the same interface is being implemented multiple times.
  
  Solution:
  
  
  Check Existing Implementations: Review the class where you are trying to implement the interface. Check if the interface is already implemented. You can do this by looking at the class definition in the ABAP Workbench (SE80 or SE11).
  
  
  Remove Duplicate Implementation: If you find that the interface is already implemented, you can either remove the duplicate implementation or modify your class to avoid the conflict.
  
  
  Use Interface Methods: Ensure that you are correctly implementing the methods defined in the interface. If the interface has methods that need to be implemented, make sure they are correctly defined in your class.
  
  
  Check Superclass: If your class is inheriting from a superclass that already implements the interface, you do not need to implement it again in the subclass.
  
  
  Review Class Hierarchy: If you are working with a complex class hierarchy, ensure that you understand where the interface is being implemented and how it affects your current class.
  
  
  Related Information:
  
  Transaction Codes: Use transaction codes like SE80 (Object Navigator) or SE11 (Data Dictionary) to navigate and check class definitions and interfaces.
  Documentation: Refer to SAP documentation for more details on interfaces and class implementations.
  ABAP Development Guidelines: Follow best practices for ABAP development to avoid such issues in the future.
  
  If you continue to face issues, consider reaching out to your SAP support team or consulting the SAP community for further assistance.