You click the Ignore checkbox in the top right as shown when you have the diagnostic selected.

Note:  The post was from last year, but the problem still exists this year, I ran into it again this with an unrelated trust, and successfully bypassed and submitted the return again.  I also ran into a new critical diagnostic for Arizona which makes no sense and is also bogus, related to capital gains over 3k.  Was planning on posting about that separately when I get the chance.