@Just-Lisa-Now-  "you don't have any additional income in Lines 11-20 to use it against (your additional income is on Line 8"

Of course he doesn't have any income on Lines 11-20, Schedule 1, because those are all deductions ("adjustments").  His additional income is on Line 8, Form 1040, as the worksheet requires.  The answer is that he has a black swan, something that once was easy, even though rare, but now with annual changes to Schedule 1 and Form 1040, the programmers have not captured.  Do an override and move on.  

I wasn't sure why someone would want to put personal property rental income in one place and deductions for it in another, and not just file Schedule C, but I suppose if there was net income that would generate SE tax.  And maybe get the return classified into a worse audit category.