What happens if the prerequisite for your course has a grade of incomplete?

I couldn't write the physics final this term because I was sick, and as a result received a DNW and am not being allowed to take two of my physics courses next term. I'm trying to argue with my professor about receiving a INC instead, since I missed the exam for a legitimate reason and had all the proper documentation, but I need to know where Waterloo stands on incomplete requisites. I can't find anything on the website and they're closed for the holidays so there's no one I can email and ask. TIA.