How to send a block from Rhino to Revit as a hosted window family

Hi, I’m trying to send a block from rhino to revit as a window family. I can’t manage to select an existing window family from revit when mapping the block. It only gives me the option to select non-hosted families. I even tried to map selecting the surface that is mapped as a wall, but no success.

Any idea why?

Cheers
Guilherme