How can the company prevent buyers from going out to purchase, and the buyers who appear because the other party can't provide invoices will benefit from it?

It is inevitable that purchasing personnel will make profits in purchasing activities. If you want to control it, there are many ways, such as internal audit of the company, budget the purchased materials, compare them after buying them back, and do more market research. Choose a responsible and knowledgeable buyer. Don't be too hard on the buyer's card, let both parties know what they are doing and click if necessary. The buyer's salary is low, and bonus compensation will be given according to the specific situation at the end of the year.