food business operators can invoice catering expenses, but they need to meet the relevant invoicing conditions and regulations. Specifically, the following points need to be noted:

1. The catering fee invoice must be true and valid: when issuing the catering fee invoice, the food business operators need to abide by the relevant regulations of the national tax authorities to ensure that the invoicing information is true, accurate and complete.

2. The invoices for catering expenses must comply with the provisions of the tax law: according to the Law of the People's Republic of China on Value-added Tax and other relevant laws and regulations, the invoices for catering expenses should be handled in accordance with the provisions and filed with the tax authorities.

3. The catering fee invoice must meet the invoicing conditions: when issuing the catering fee invoice, the food operator must meet the corresponding invoicing conditions, such as holding a business license, taxpayer identification number, etc.

4. The catering fee invoice must meet the invoicing requirements: when issuing the catering fee invoice, the food operator must abide by the relevant regulations of the national tax authorities, such as the face information and invoice format. In short, food business operators can issue invoices for food and beverage expenses. When issuing invoices for food and beverage expenses, they need to strictly abide by relevant laws and regulations and relevant provisions of tax authorities to ensure that the invoices are true and effective, so as to avoid unnecessary legal risks.