I agree that this situation is ridiculous. TurboTax knows exactly where it got the number that it entered on Form 1116. TurboTax should be able to regurgitate the description from the source form. In my case it was "Income distribution deduction" from Form 1041, line 18, so that's what i put in the explanation. That solved the error. Hopefully the IRS will be happy with the explanation. Time will tell.
