In ...
(2) invoice purpose:
Stamping principle: the invoice copy and VAT invoice deduction copy should be stamped with the taxpayer's invoice special seal.
Principle of self-use: invoices shall not be lent or opened on behalf of others.
Principle of separate use: it should be used within the scope specified in various invoices.
Principle of using serial number: it should be used in serial number, and it is not allowed to use it alone or skip the number.
The handwriting is clear and shall not be altered.