How To Fix OO010 - &1 is not a &2, it is a &3

SAP Error Message - Details

• Message type: E = Error

• Message class: OO - Class Builder/API

• Message number: 010

• Message text: &1 is not a &2, it is a &3

What causes this issue?

You tried to access &V1& as&V2&. However, &V1& is a &V3&. This action
cannot be performed successfully.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message OO010 - &1 is not a &2, it is a &3 ?

  The SAP error message "OO010 &1 is not a &2, it is a &3" typically indicates a type mismatch in the context of object-oriented programming within SAP ABAP. This error occurs when the system expects an object of a certain type (denoted by &2) but instead receives an object of a different type (denoted by &3).
  Cause:
  
  Type Mismatch: The most common cause of this error is that the program is trying to use an object that is not of the expected class or interface type. For example, if a method is expecting an object of class A but receives an object of class B, this error will be triggered.
  Incorrect Object Instantiation: The object may not have been instantiated correctly, or the wrong class may have been used during instantiation.
  Inheritance Issues: If the object is expected to be of a certain subclass but is actually of a different subclass or superclass, this error can occur.
  
  Solution:
  
  Check Object Type: Verify the type of the object being passed to the method or function. Ensure that it matches the expected type.
  Correct Instantiation: Ensure that the object is instantiated from the correct class. If you are using inheritance, make sure that the object is of the expected subclass.
  Debugging: Use debugging tools to trace the flow of the program and check the types of objects at runtime. This can help identify where the type mismatch is occurring.
  Review Method Signatures: Check the method signatures to ensure that the parameters are defined correctly and that the expected types are being adhered to.
  Type Casting: If appropriate, consider using type casting to convert the object to the expected type, but be cautious as this can lead to runtime errors if the object is not actually of the expected type.
  
  Related Information:
  
  ABAP Object-Oriented Programming: Understanding the principles of object-oriented programming in ABAP can help in diagnosing and resolving such issues.
  SAP Documentation: Refer to SAP's official documentation for more details on error messages and object-oriented programming practices.
  Community Forums: SAP Community and other forums can be useful for finding similar issues faced by other developers and the solutions they implemented.
  
  By following these steps, you should be able to identify and resolve the cause of the OO010 error in your SAP environment.