This question already has an answer here:
The description of the "not an answer" flag states:
This was posted as an answer, but it does not attempt to answer the question. It should possibly be an edit, a comment, another question, or deleted altogether.
If an answer was marked as accepted, that practically proves that the given answer did help the asker solve the problem.
So, should it even be possible to flag accepted answers as "not an answer"? If I'm wrong, please give me an example or a constructed scenario of a situation, where this is appropriate.