Under a fair competition regulation, soba was standardized as "the noodles contain at least 30% of buckwheat." This definition caused a problem when Okinawa was returned to Japanese rule in 1972. In 1976, the Fair Trade Commission tried to make Okinawa Prefecture drop the name "soba" because Okinawa's soba did not conform to the regulation. The Okinawa Noodle Manufacturing Co-op negotiated with the Fair Trade Commission and as a result it was accepted as one of several exceptions under the name of "Okinawa soba".