yes. Gansu Electronic One-Ticket refers to the detailed rules for the implementation of food safety traceability management measures in Gansu Province, which was formulated and promulgated by Gansu Food and Drug Administration on October 26th, 2114. It requires medium-sized and above catering units and school canteens to establish electronic purchase ledgers in an all-round way, and encourages small catering units with conditions to speed up the establishment and use of electronic traceability platforms. Suppliers who cannot provide electronic one-ticket can not purchase goods, but can open them as long as they have their business licenses and food licenses.