Write off according to the normal procedure first, write down the number of the verification form on the verification form, and stamp it at the bank.

Then, when you go to the foreign exchange bureau, write down the amount in the blank space of the memo (that is, how much money has been added after deducting your write-off amount this time, write it clearly)

Other as usual.

After cancellation, there is still money in your memo. In the future, when the amount of other verification documents is not enough, you can use this to offset it.