Stipulations about "I" (移) can be seen in the remaining part of Kaigen Ritsuryo of Tang dynasty which was excavated from the remains in Dunhuang City; they are similar to stipulations about "I" (移) in Kushiki-ryo (law on state documentary forms in the Yoro Code) of Taiho Ritsuryo and Yoro Ritsuryo and so it is believed that "I" (移) in Japan was brought from China code.
敦煌市の遺跡から発掘された唐の開元令の残部に移に関する規定が残されており、大宝律令・養老律令の公式令(律令法)の移の規定に類似しており、日本の移が中国律令の移入であったと見られている。