Takashi TAKAHASHI, the first person who paid attention to this point, argued that the law of the nation's governance means a law of ruling and therefore, naturally it means nothing, but the Rituryo codes, and the Ritsuryo established by Emperor Tenchi is Omi-Ryo, thus Fukai-no-Joten/ Fukaijoten is the Omi-Ryo.
初めにこの箇所に着目した高橋崇は、食国法は統治の法のことであるから、律令に他ならず、天智天皇の定めた律令は近江令のことだから、不改常典とは近江令のことであると論じた。