Foreign Currency wire through Financial Gateway with USD ledger only---Grants issue on cost collect

We are implementing 9.2 at Emory University and implementing Financial Gateway for all of our AP payments--ACH and wires both USD and foreign currency. We only have USD as our base currency and only USD ledgers--so no multi-currency. We did a proof of concept of how the currency gain/loss would be calculated (see attached). DELIVERED, there would be a gain/loss in AP if the foreign payment was made on a different day than the voucher. But there would ALSO be a gain/loss recorded through the recon tolerances in bank statement accounting. This is where I'm concerned. The bank statement accounting