I got the the same spurious error message today, April 15:
/Return/ReturnData/IRS1116/ForeignTaxCreditSource/USTaxWithheldOnDividendAmt - Data in the return is missing or invalid.
After restarting TTax and continuing with the afflicted tax file, TTax recognized the general nature of the reported problem, but beyond directing me to the Foreign Taxes section of Federal Taxes -> Deductions & Credits and telling me to go through the process, it wasn't much help.
So I parsed the message and looked for something about US Tax withheld in the Step-by-Step process with nothing obvious cropping up, then Form 1116 and its its worksheet in Forms view. After coming up dry there, I looked for a clue on my broker's 1099s with foreign dividends reported. No dice. Giving up and typing the term USTaxWithheldOnDividendAmt into Google, this thread came up. Yep, that the same message I got. 4 Pages... hmmm, I must not be the only one!
I have three copies of 1116 because of foreign tax withheld by six countries and one mutual fund.
It appears that TTax is copying the country name into the date field for each country's line in Part II, instead of a date or other keyword. So I replaced each country's name in that part of the worksheet with the date of the last withholding for each country, and 12/31/20 for RIC as suggested. That worked, and my return was accepted! Yay!
Of note, TTax substituted "1099 taxes" into Column l (little 'L') Line A of form 1066 for the RIC instead of 12/31. Whatever. I don't care any more.
Ugh! Hey, TurboTax! This is a problem!
Thank you @venkyus for publishing your finding!
