ask my dearest teachers

I have no answers to the questions that I don't know how to do , so I need your help,teachers, thank you vey much.
Fill in the missing word.
Your L/C No. 123 is short established the amount of $1000. Please fax the necessary______.

[Mister Micawber]

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Sorry, you should take a guess at least, before you post, Yuanbin. We respond with much more enthusiasm when we see the student making an effort. Thanks for visiting us, though.

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yuanbin, you must be an trader.
i am a banker.
i think the word you are looking for is 'amendment'
oh... and don't forget to amend the expiry date as well