You don't need an amount on the box 20 line of the K-1 wks for your QBI to calculate. The QBI calculation is "driven" from the entries in Sections D1 and D2 of that K-1 Partner form.
In Forms mode, look at the K-1 Partner, QBI Component, and QBI Ded Summary forms for any box shaded red. In particular, on the K-1 Partner form for your K-1, scroll down to Section D1 and Section D2 to look for a box shaded red. If no box is shaded red, try to "trace" the amounts in Section D1 and D2 to the QBI Component form for that K-1, and from the QBI Component form to the QBI Ded Summary form to find "what is happening" in your QBI calculation.
@JSW74
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