The invoice code of VAT ordinary invoice (discounted ticket) is adjusted to 12, and the coding rule is: 1 0, where the 2nd-5th digits represent provinces, autonomous regions, municipalities directly under the central government and cities with separate plans, the 6th-7th digits represent years, the 8th 8- 10/0 digits represent batches, and the 1st/kloc-0 digits represent batches.