Reviewer > Provided PTC reviews > Correctness reviews > Duplicate abstract operation (Reviewer Review)
Duplicate abstract operation (Reviewer Review)
Checks whether classes have abstract operations that are already declared on superclasses.
This often happens when an operation is control+dragged to copy it to a subclass.
This is not a valid model and cannot be implemented, but the problem is minor.
Typically, you will want to clear the abstract checkbox from the subclass.
When refining operations using the class browser the abstract option will be automatically removed, so this can be a good practice.