Company B concluded with Company D an export contract on CIF with L$/$C payment. The contract stipulated that shipment be made during August, $2020.$ 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 repeatedly to open the L$/$C$.$ On August $5$th$,$ 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 $28$th$.$ Even though the 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. As a result, the issuing bank refused to make payment to Company B$.1)$ Can the bank reject to make payment to Company B$?2)$ What are the lessons?