A Chinese company exported food products to Rotterdam under L/C. The L/C issued by the buyer stated that the exporter should provide Sanitary Inspection Certificate in which the wording "the food free from illness and are up to standards for eating" was required. After shipment, when the exporter negotiated for payment, the negotiating bank found that the certificate presented by the exporter didn't show the wording "the food products are free from illness" required in the L/C. The negotiating bank deemed it a discrepancy and asked the issuing bank for opinions. However, the issuing bank didn't answer. In order to avid dishonor by the issuing bank, the exporter had to asked the inspection body to issue another certificate that was in line with the requirement of the L/C. As a result, the exporter suffered losses resulted from the 20 days' delay in the settlement for payment. What lesson the exporter should learn form the case?