Does the authors opinions or solutions to the reviewed problem have to be inculded in a review paper?
I agree that the request seems odd, but I haven't read your paper. For many things no real &quot;solution&quot; would be possible. For others, it might be. Think about the request and see if there is something that is worth saying in the paper, but it might just be that a note to the editor that the request isn't really possible to fulfill in the current context might be enough.
It is possible that the reviewer is inexperienced, but it is also possible that the reviewer is very experienced and sees something that you haven't noticed. So, it is worth a look.