Legal analysis: When stamping, you must only use the special invoice seal, not the financial seal, and not both. When stamping, only the invoice stamp and deduction stamp are required, and the bookkeeping stamp does not need to be stamped with the special invoice stamp (ordinary invoices only need to be stamped with the invoice stamp, and special tickets need to be stamped with the invoice stamp and bookkeeping stamp). The special invoice seal must be affixed to the lower right corner of the invoice.

Legal basis: Article 22 of the Measures for the Administration of Invoices in People's Republic of China (PRC) shall be issued in accordance with the prescribed time limit, sequence and columns, all of which shall be issued at one time and stamped with special invoices.