With the progress of developments in shoen, conflict between kaihatsu-ryoshu (local nobles who actually developed the land) and kokushi intensified over the scope and the target of Fuyu (tax exemption), and more and more shoen acquired Funyu no ken (the right to keep the tax agents from entering their property) so they could take advantage of refusing the entry by kokushi's envoy.
荘園内での開発が進展するにともない、不輸の範囲や対象をめぐる開発領主と国司の対立がはげしくなると、荘園領主の権威を利用して国司の使者の立ち入りを認めない不入の権(日本)を得る荘園が増えた。