This could be that (as we have been told in our case) unless the "bedroom" has a window which can be used to escape in case of a fire, then it's really not a "bedroom" and can't be classified as such. If it's in the basement, probably does not have a window...
We have the same issue, fully finished basement with two "bedrooms" and full bath, but the bedrooms can't be listed as such by RealEstate agents. If you list it as FSBO, you can say whatever you want in the listing, but the official sales document still won't count those basement bedrooms as such...which can be good for tax purposes.
Now, before anyone flames me, I'm not an expert, but only stating what was told to us by our inspector and confirmed by our closing lawyer.