Thanks, TaxGirl3.

I didn't realize that Proconnect already took into account that the client had received their refund. I ran the "Check Return" and it showed the full refund and thought that was how the Amended Return would be filed, but when I previewed the forms, the 1040X properly accounted for the already received refund and showed the net difference.

I didn't have to make any changes or adjust anything.