On the 1040 S-corp K-1 worksheet it's on page 6 as you scroll down the front page of the K-1: "Section D1 Qualified Business Income Deduction - Statement A Information".

I think your question may be from the 1120S perspective, not the 1040 entry perspective. My reply was based on the 1040 entry side since the QuickZoom link on the K-1 entry worksheet for line 17 code V didn't direct me to the correct place.

On the 1120S side, I didn't have any issues getting Statement A to populate correctly.