The collection document number provided by the bank shall be filled in the collection document. Technically, it is the balance of payments declared by the bank after receiving the money, with 12 figures. The format is:

123456+ 1234+ 12+n 00 1

Foreign exchange bureau code bank identification code bank code balance of payments series code

Fill in the form correctly and be careful. It doesn't matter if you were wrong in the past, the foreign exchange bureau will not hold you accountable. If you make a mistake in the future, there may be problems, hehe.