有这样的信用证付款条件吗？（印度）

（出口印度的）PAYMENT TERM:20% T/T in advance before shipment,80% irrevocable LC at sight after receiving the copy of original BL 这样的付款条件有什么弊端。。 请教一下各位，付款条件谈不下，我方要求必须在出货前到信用证，而客户一直坚持看到提单副印件了在给信用证，请问怎样可以解决？ 以下是客人的回复： As i he been telling you that even our company has import payment policy & in that we never give advance payment to any new supplier as a special case and on Ranjay's request i could convince our management to pay 30% TT last time. We can either give 100% LC at sight in advance or pay you 20% TT in advance and balance 80% LC at sight immediately after receipt of scan copy of original BL. We were also wanting that if you along with your boss could visit us then there would he been more clarity and confidence between us. Anyhow try to plan isit once you are back to work after your delivery, we are wanting to do a good volume business with you so you also he to show confidence in us, we can arrange 20% TT payment immediately after receipt of your PI, so kindly send us your accepted PI immediately.