How To Fix OL591 - Method '&' is implemented but not defined

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 591

• Message text: Method '&' is implemented but not defined

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 OL591 - Method '&' is implemented but not defined ?

  The SAP error message OL591, which states "Method '&' is implemented but not defined," typically occurs in the context of ABAP programming, particularly when dealing with Object-Oriented ABAP (OOABAP). This error indicates that a method has been declared in an interface or a superclass but has not been properly defined in the implementing class.
  Cause:
  
  Method Declaration Without Implementation: The method is declared in an interface or superclass but lacks a corresponding implementation in the subclass or implementing class.
  Incorrect Method Signature: The method might be defined with a different signature (parameters, return type) than what is declared in the interface or superclass.
  Incomplete Class Implementation: The class that is supposed to implement the method may not have been fully implemented or activated.
  
  Solution:
  
  
  Implement the Method: Ensure that the method is implemented in the class that is supposed to provide the functionality. You can do this by:
  
  Navigating to the class in the ABAP Workbench (SE80 or SE24).
  Adding the method implementation in the class.
  
  
  
  Check Method Signature: Verify that the method signature in the implementation matches the declaration in the interface or superclass. This includes checking:
  
  Method name
  Parameters (types and order)
  Return type
  
  
  
  Activate the Class: After implementing the method, make sure to activate the class. In ABAP, changes are not effective until the object is activated.
  
  
  Check for Inheritance: If the class is inheriting from a superclass, ensure that the superclass is also activated and that there are no issues with the inheritance chain.
  
  
  Debugging: If the issue persists, you can use the ABAP debugger to trace where the method is being called and confirm that the correct class is being used.
  
  
  Related Information:
  
  ABAP Workbench (SE80): This is the primary tool for developing and managing ABAP programs, classes, and interfaces.
  Class Builder (SE24): This transaction is specifically for creating and managing ABAP classes and interfaces.
  Interface Definition: Ensure that the interface where the method is declared is correctly defined and activated.
  Documentation: Refer to SAP documentation or the ABAP programming guidelines for best practices in object-oriented programming.
  
  By following these steps, you should be able to resolve the OL591 error and ensure that your method is properly implemented and defined.