I did that too. It is not asking me for the business use percentage for it unless when I add the depreciation of the asset, and it still does not calculate properly.
Few notes tho :
1. I marked that the property was rented all year. (even tho its mixed use, the rental part of it was rented out or at least tried to be rented out all year and had no personal use)
2. There is also a question asked about how i aquired this rental? I indicated none of the above since I did not purchase the rental! (as in, I did not purchase this as a rental and It is my home)
I'm not sure if any of above has any impacts.
