I am working on Schedule SE.  Part III line 18 asks to move the portion of line 3 (net profit/loss) that can be attributed to March 27, 2020 - Dec. 31, 2020. The line 3 is a negative number.  When I enter the negative number there is an error stating the number must be equal or greater than 0.  Then when I enter a zero it state the max deferral line is to large.  Bottom line is I can not get rid of the error on line 18 no matter what figure I use.  Thoughts.