The separation of tickets and goods cannot be false. Invoice refers to the business vouchers issued and collected by all units and individuals in buying and selling goods, providing or receiving services and engaging in other business activities. It is the original basis of accounting, and it is also an important basis for law enforcement inspection by audit institutions and tax authorities. Receipt is the proof of receipt and payment, and invoice can only prove that the business has happened, but can't prove whether the money has been received or paid. Invoice refers to the text issued by the seller to the buyer in economic activities, including the name, quality and agreed price of the products or services provided to the buyer. In addition to the advance payment, the invoice must also include the money paid by the buyer to the seller according to the agreed conditions, and must include the date and quantity, which is an important proof of accounting.

Measures of People's Republic of China (PRC) Municipality on Invoice Management

Article 20

All units and individuals engaged in production and business activities shall ask the payee for invoices when purchasing goods, receiving services and paying other business expenses. When obtaining the invoice, you are not allowed to change the name and amount.