我国某出口公司G收到国外来证，其中“DOCIJMENT、REQIRED”中要求如下：“BENEFICIARY S SIGNED DECLARATION STATING THAT：1／3 ORIGI-NAL MARINE B／L AND ONE SIGNED ORIGINAL OF EACH OTttER DOC-UMENT、PRESENTED AT THE BANK WERE SENT、DIRECTLY TO BLLHAIFA BY SPECIAL COURIER(IF SHIPMENT、EFFECTED BYSEA)ORPHOTOCOPY OF ORIGINAL CERTIFICATE OF ORIGIN AND ONE SIGNEDORIGINAL OF EACHDOCUMENT PRESENTED AT THE BANK WAS AT-TACHED TO ATD ACCOMPANYING THE GOODS(IF SHIPMENT、EF-FECTED BY AIR)”(受益人签署的声明书，证明1／3正本提单和其他正本单据通过特别快件直接寄给BLL HAIFA(如果是通过海运)或原产地证书的副本与其他正本单据已随货物(若通过空运))。G公司将全套3份正本提单及所要求的发票、装箱单及其他REQUIRED DOCU-MENTS交给中国深圳通知行，后经中行复审无异后，然后交全套单据寄往国外开证银行承兑。中行于到期日收到开证行通知：“因所交单据与信用证要求不符，拒付货款。不符之处为：信用证在所需单据第(7)款中要求，若为海运，1／3的正本单据需用特快专递直接寄往BLL HAIFA”。 因此，G公司立即与客户联系，说明由于工作疏忽没有按信用证要求办理，请其尽快付款赎单。不久客户办理了付款赎单，终于顺利解决了此案。请分析此案给予我们哪些教训?今后要怎样防范此类问题?