Deductions & credits

Amy, yes the loan is secured by a mortgage that was properly drawn up by an attorney, executed, and properly filed and recorded in the county clerk office in the county where my son lives. The mortgage debt has an amortization schedule and is paid monthly in accordance with that schedule. My son files a 1040 and itemizes his deductions on Schedule A (Itemized Deductions). He does NOT have a Form 1098 because I am the lender.  Therefore, his mortgage interest expense should go on Line 8b on Schedule A, not on Line 8a. I was NOT the seller.  The issue is that in Turbo Tax, it seems as though the only way to get mortgage interest expense with NO form 1098 correctly on Line 8b of Schedule A is to check the box that says that the purchase was Seller Financed, which it was not. So my question is simply, how do I do this correctly in the Turbo Tax screens.