The online versions of TT are not quite as flexible as the desktop versions; allowing to enter directly on a form.
My recommendation is to go into the applicable K-1 and go through the questions. As you address each screen, there should be a question regarding using debt to purchase your interest or something to that effect. This may require going into a "not common expense" section or something to that effect.
This is where you would enter that interest expense.
The interest expense should then be reflected on a separate line on your Schedule E titled "business interest".
I would then remove the box 20 entry input.
*A reminder that posts in a forum such as this do not constitute tax advice.
Also keep in mind the date of replies, as tax law changes.
