That was virtually a declaration of divesting the Ogigayatsu-Uesugi family of its position of kokushu (kokushu daimyo), because Sagami was ryoseikoku (province) where the Ogigayatsu-Uesugi family served as Shugo.
相模は扇谷上杉家が守護を務めている令制国であり、事実上同家より国主の地位を剥奪する事を宣言したものであった。