外贸单证：有关L/C中提单操作问题

客户开来的信用证中关于提单的要求如下,大家帮忙看以下:
FULL SET OF THREE ORIGINAL PLUS THREE NON-NEGOTIABLE COPIES OF LADEN ON BOARD OCEAN BILLS OF LADING MADE OUT TO ORDER ENDORSED IN BLANK,MARKED FREIGHT PREPAID AND SHOW SWITCH B/L TO BE ALLOWED IN BANGKOK AND EVIDENCING THAT GOODS HAVE BEEN SHIPPED FROM TO SAN ANTONIO,CHILE.
提单要求的转换提单该如何操作,EVIDENCING 是不是要显示在提单上面呀?
请大家帮忙呀，谢谢!


网友回答: 
在提单中显示SWITCH BL TO BE ALLOWED IN BANKGKOK
让船公司出个证明
个人理解,问问银行