New for 2017 is the following flaw: If there is an entry in 1099-DIV box 6, TT will immediately and incorrectly require an entry in box 6d and will mark it as an error until an amount is entered. Box 6d is “the foreign source amount included in dividends.” If F1116 is filled out, there is a screen to input that amount which TT will insert into box 6d and thus clear the error. If F1116 is not filled out because the user elects to use the exemption or the deduction, then bring up the 1099-DIV worksheet and type a zero into box 6d to remove the error.
New for 2017 is the following flaw: If there is an entry in 1099-DIV box 6, TT will immediately and incorrectly require an entry in box 6d and will mark it as an error until an amount is entered. Box 6d is “the foreign source amount included in dividends.” If F1116 is filled out, there is a screen to input that amount which TT will insert into box 6d and thus clear the error. If F1116 is not filled out because the user elects to use the exemption or the deduction, then bring up the 1099-DIV worksheet and type a zero into box 6d to remove the error.
If you have an amount in Box 6 of 1099-INT, Turbotax is supposed to ask for Foreign Source Income, as it does for 1099-DIV. But it fails to do so, which is why you get the error on Federal Review. But you get a chance to enter that amount during the Review when it tries to fix the error. By the way, entering 0 in that box is not advised, because you are then not entitled to a tax credit. Turbotax does not seem to care, but at audit you might get that credit erased. Just put in an amount that is your guess as to how much of this interest income was foreign.