Or short answer... for dealing with rental income in F1116, use Sch E to populate Line as all those expenses are Definitely Related Expenses. The mortgage interest and property taxes they are referring to on Lines 3 & 4 in F1116 are for your PERSONAL mortgage interest and property (i.e. from where you live) not your rental property, that's why they'd be taken from Sch A.
Same answer as above, just realized I could have said it in two sentences!
