From TT's guidance:
Due to complexities in how the foreign tax credit is computed it is possible in some situations that the income with the most taxes may not be the income that generates the largest foreign tax credit. If following these instructions still results in an error during Smart Check related to Form 1116, Line 24, then that is what occurred. You'll need to revisit the Foreign Tax Credit interview and delete the first copy of the form. Complete the interview, and then start again and re-add the information from the copy you deleted. This will re-order the forms. Visit Smart Check again to see if the correct copy is now first (i.e. the error has gone away). Repeat this process until the form with the largest credit has moved to the beginning.
