Line 16 cannot be overriden with the Online version, only the desktop (CD/Download) versions.
Also, the IRS instructions in the link you posted (for Sch K-1 (1041)) conflict with the IRS instructions for Line 16, Sch A. I can refer you to the link below to IRS Notice 2018-61 and will tell you that future deductibility doesn't look good considering the language at the bottom of page 7 to the top of page 8.
<a rel="nofollow" target="_blank" href="
https://www.irs.gov/pub/irs-drop/n-18-61.pdf">https://www.irs.gov/pub/irs-drop/n-18-61.pdf</a>
