I suspect you will have to override.
I entered your figures on a test return and it appears as if the capital gain distribution figure (Box 2a amount) is throwing the computation for the nominee distribution out of whack (for some strange reason).
Regardless, I was able to override the figure directly on Schedule B (input "-3014") without any issues. Further, I discovered that the return passed the error check with no flags, despite the fact the override appeared in red.
