I am entering a 1099-DIV for a Calif Municipal Fund. Correct to check “a portion of these dividends is U.S. Gov't interest” and enter exempt-interest dividend amount?

In my 1099-DIV, I only have info in boxes 11 (exempt-interest dividends), 12 (specified private activity bond interest dividends), and 13 (State), which is California. So I enter this, and then check "a portion of these dividends is U.S. Gov't interest," and then enter the amount in box 11. Why might it be that when I complete/save, TT keeps telling me it needs Review?