Deductions & credits

i'm in the same situation, Vanguard has 1 page that shows the foreign tax (from box6), foreign income, and QDI eligible foreign income. So in TT, when going thru the foreign tax credit screen for a particular mutual fund, it is asking to enter the amount - Foreign-Source Income.  So just like the original question and the one posted by gradysullivan, i think its just either the number under foreign income or QDI eligible foreign income, both of which are lower than what's in box1(total ordinary div)or box1b (qualified dividends) but i'm not sure which one. anyone knows?