Voucher matched via rule Sum Up To - cannot figure out why

We are on 9.2 Image 30.

We have a voucher line that matched via Match Rule Sum Up To. I cannot figure out how the AP_MATCH app engine decided this.

The Document Association Rules are as follows

Sequence 1, Rule Equal, Voucher Quantity, Receiver Qty Accept

Sequence 2, Rule Sum Up To, Voucher Quantity, Receiver Qty Accept

I navigated to Accounts Payable>Review Accounts Payable info>Interfaces>Purchase Order and gleamed the following information for the PO Line in question.

PO line 3

PO Qty: 2

PO Merchandise Amt: 240.50

Voucher Line Qty: 2

Voucher Merchandise Amt: 240.50

Receiver Accept Qty: 1

Receiver Amount: 120.25

Match Status of the related lines on the PO, Voucher, and Receiver are all Matched.