Besides, the system of shiki (the right of property, title, etc.) underlying Shoen koryo sei; the land governance system in the middle ages, started becoming unstable with the `transfer of shiki;' shiki was transferred using money or was not always succeeded by heredity while the succession of shiki (the right of property, title, etc.) had been based on hereditary transfer in most cases until then.
また南北朝期の頃から、荘園公領制を支えていた職の体系が動揺し始めており、それまで職（しき）の継承は世襲による場合が多かったのに対し、職が金銭で売買されたり、必ずしも世襲によらなくなるなど、職の遷代と呼ばれる現象が起きつつあった。