Company B concluded with Company D an export contract on CIF with L/C payment.The contract stipulated that shipment be made during August, 2006.But the time for the arrival of the L/C was not specified.By the end of July, the L/C hadn't arrived,Company B had to urge Company D to open the L/C repeatedly.On August 5th, a copy of the L/C application was provided by Company D to assure B of the issuance of the L/C.In order to make delivery within the stipulated time period, Company A made arrangement for shipment.Finally the original L/C arrived on August 28th.Even though documents required in the original L/C were different from those in the contract clause, B overlooked the discrepancy and prepared the documents according to the contract after shipment.As a result,the issuing bank refused to make payment to Company B.What are the lessons?