Did you try leaving it blank? (not sure if it will allow that but I thought I recall the original instructions on the screen prompts to leave blank if paid off ...
Sorry forgot to respond later that night when NONE of that worked. Sigh. Got someone trying to help me now on it as I also can't view/edit my schedule E.
I just "chatted" with support and they said for the new form to get used, I had to delete my previous 1098 entries and clear cache and cookies and re-enter for ...