Business & farm

Yes, box 20 code Z is just an indicator that there is a Qualified Business Income (QBI) statement. Most likely what you have on your paper Schedule K-1 is just box 20, code Z - "STMT" or "See Statement". 

What you need to do to enter the QBI deduction is to enter the information from your statement in Section A, which shows in the screen shot you sent. It's behind the dropdown menu. 

You should have a box 20 statement with your K-1 which shows some of the information shown in the image below. Enter the items that match your statement and leave the rest blank.

As Patricia V mentions above, it may be easier to enter it in Forms mode.