Official Document Number 
Official Document Number
Definition
See
Official Document Number.
Use
In China, the official document number is used in conjunction with the
official lot number to form a unique identification code for each prenumbered form.Structure
The official document number contains eight digits and the documents are numbered consecutively. For example:
00011543
00011544
00011545
This eight-digit number is pre-printed in the upper right-hand corner of the special invoice.