Investors & landlords

This starts with Form 4952 “Investment Interest Expense Deduction”.   The amount in line 8 is transferred to Schedule A line 9.  A copy is then sent to the f1116 worksheet 4(b)(1)(a).  The screenshot data is from the example in the f1116 instructions on p.16 for a stock portfolio.  Bring up the f1116 worksheet.  What do you see?  Is there an entry in (a)?  If so then you would insert the amounts in (b) and (c) , then TT completes the rest.