It is because according to contract terms, the L/C is only valid up to 90 days after the date of shipment. For cost-saving purpose, mann hopes that the latest date of shipment and the validity date of the L/C can be extended together. Further, for safety sake and taking into consideration that it will take 3 months for mann to complete the equipment installation procedures, they requested that the validity date of the L/C be extended to September. TIC finally agreed to annd's (是mann吗) request on condition that Zimmermann shall bear the full cost of the additional fees incurred by such an extension.