Record a forward contract on the contract date on the balance sheet from the seller's perspective. On the liability side of the equation, you would credit the Asset Obligation for the spot rate. Then, on the asset side of the equation, you would debit the Asset Receivable for the forward rate.
Another risk that arises from the non-standard nature of forward contracts is that they are only settled on the settlement date and are not marked-to-market like futures. What if the forward rate specified in the contract diverges widely from the spot rate at the time of settlement?