One of two TTX bugs;
1) if you only have $$ in box 11 of the 1099-DIV, you need to have a 0,.00 in box 1a.
2) If you are breaking out US Govt Bond interest that is a part of box 1a...then:
Edit that 1099-DIV.
On the main form page that shows boxes 1a, 1b and 2a ?
a) .....make sure those boxes show whatever your Mutual fund sent out.
b) Then check the box to expand the form to show all the other boxes.
c) Scroll down to the bottom of the page and hit "Continue"
d) Check the box for Part is US Govt interest as you did before and Continue.
e) Enter the US Govt interest amount as you did before...& Continue
Should be OK now.....simply checking the box in #2 clears the "Review" error.