Why can't Shengdao's electronic invoice system select category details?

Internal instability of the system. Invoicing system refers to the system that enterprises issue value-added tax after applying for invoices. When selecting category details in the system, the customer can't open it because of the internal instability of the system, which makes it impossible to select in the system. Value-added tax is a turnover tax based on the value-added amount of goods (including taxable services) generated in the circulation process.