In those days when an increasing number of people made gift/donation of territories and right of governing manors, the principle of "wayo," or transfer of rights which cannot be canceled was introduced to ensure the security of title is believed to have helped to decrease the number of lawsuits about title.
この時代、所領所職を媒介とした譲与・寄進が盛んになる中で、所有権の安定を図るために悔返の出来ない権利移転である「和与」の原則を導入することで、所有権を巡る訴訟抑制の効果があったと考えられている。