I'm unable to duplicate your error. Are you saying that the mortgage interest deduction is not appearing on your return at all?
Disallowed home office deductions don't roll forward into the upcoming year - if your home business has a loss then the home office deduction for that year is just gone.
But you are correct that the mortgage interest should be entered onto schedule A in its entirety if you aren't using it elsewhere on the return (and assuming that you can itemize deductions).
@mg811
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