甚麼叫 transfer L/C (urgent)

TRANSER (TRANSFERABLE) L/C - 可轉讓信用証
BUYER (APPLICANT) 開出的 MASTER L/C 給 SELLER (BENEFICIARY) 而 SELLER 是經由第三者供應商生產或購入貨物，有時可能 SELLER 資金周轉的問題或不想預先付款，就會向 BUYER 及供應商提出做 TRANSFER L/C，如沒有問題就 APPLICANT 就會向 ISSUING BANK 開出 MASTER L/C 註明可轉讓及THIRD PARTY DOCUMENT ACCEPTED的給 SELLER (1ST BENEFICIARY)，而 SELLER 的 ADVISING BANK 會通知 SELLER (1ST BENEFICIARY)，而 SELLER 會經自己的銀行 / ADVISING BANK 憑 MASTER L/C 再轉開一份 TRANFER L/C 給 SUPPLIER (2ND BENEFICIARY)。
當出貨後，SUPPLIER (2ND BENEFICIARY) 入單銀行向 SELLER (1ND BENEFICIARY) 收款，而 SELLER 的銀行 / ADVISING BANK 會通知 SELLER (1ST BENEFICIARY) 已收到L/C 文件，而 1 ST BENEFICIARY 可能要把自己的文件入銀行套換 2ND BENEFICIARY 一些文件 (如 COLLECTION LETTER, DRAFT, INVOCIE , PACKING LIST)，再向 APPICANT 收款的。
這樣做法 SELLER (1ST BENEFICIARY) 就不用自己先付款給 SUPPLIER (2ND BENEFICIARY)，而這樣做法三者都有保障。

It is an issue of export financing. You can wholly or partially transfer the L/C you received from your customer to your suppliers at your request, provided the L/C is“transferable”. The suppliers will then feel safe to manufacture or sell the goods to you. The following web-sites are quite informative.
http://www.bochk.com/web/common/profile.xml?section=corporate&level_2=trade_finance&fldr_id=458&pfid=203
http://en.wikipedia.org/wiki/Letter_of_credit