All the forms generated by the imported data were flagged with red symbols, and these forms contained fields in pink. Therefore I filled those fields. Then error flags disappeared. No numbers were modified. I also changed the titles of the forms. However, the titles of the imported data from which forms were generated were not automatically updated. I now assume that imported data are used only to generate forms, and they are not used for tax calculations. Am I right?
One advantage of working with forms is that we can "add foreign tax paid" easily.
Imported data is used to make the entries on tax forms. Once the numbers appear on the tax forms that information is used in tax calculations, as you mention.