Self-employed

I was filling out my "Rental Summary".  Under the "Expenses" portion, I entered in my various expenses.  There is one field labelled "Interest"  I entered in my non personal portion of my mortgage interest expense.  This amount I entered in, I noticed it show up on when I was on the "Review:Warnings" section.  "You have claimed CCA or other carrying charges and deductions on your rental properties, which may have alternative minimum tax implications on the T691."  When click on "review button" and then "continue" to the "Rental and leasing Property" section, I see the same amount of my mortgage interest populated into the "capital cost allowance (CCA) and carrying charges claimed on rental and leasing property" field.