Abstract operation defined (Reviewer Review)
The functionality of an abstract operation has been defined on a sequence diagram (indented after a call to the operation).
If the operation is abstract it raises the question of where the implementation would exist.
Consequences
The model may be inaccurate leading to developers being unable to implement the solution.
Strategy
Sometimes this technique is used to show an example of the functionality that the subclass would implement. This is a legitimate technique and the review item should be ignored.
Alternatively, decide whether the operation should be abstract.