A foreign buyer negotiates with a foreign exporter for goods to be shipped out of a foreign port. To protect itself from fraud in the transaction, the buyer requires that the exporter provide an inspection certificate as one of the documents to be presented for payment. When the documents were presented for payment, the buyer noticed that the date on the inspection certificate was later than the shipment date on the bill of lading. The certificate failed to state when the inspection occurred. Can the buyer refuse payment due to this discrepancy?