If I remember correctly, go to the K-1 worksheet and look below the 'normal' K-1 boxes.  There are a million various worksheets, etc and some of them deal with QBI.  Somewhere in that mess you would enter the amount.

With that being said, although the IRS says to reduce QBI, it is illogical because it is essentially double-deducting it and therefore could potentially be open to court cases.