After you file

What is on line 18? As you say and the instructions say it is the amount shown on the original return. But if I use that value, then Line 20 the Amount You Owe will be 0.
If I update line 18 to the amount now shown on the return with the K1 entered, then Line 20 the Amount You Owe will be the amount of the original refund I got minus the amount for the taxes from the K1. That is what I owe. It should be easier to give them money...