half wall underneath doorway

[bdcustomhomes]

I have an open archway door detail about 10' wide. I would like to add a 5' long half wall below the archway but Designer Pro keeps eliminating archway when I add half wall in same place. The half wall supports counter top which is elevated above base cabinet counter so as to make breakfast bar underneath arch detail. Is there a way occupy the same space with doorway and half-wall?