There is a theory which says that ritsu was enacted at the same time (the Asukakiyomihara Ritsuryo theory), but a commonly accepted view is that at the time the ritsu part was adopted from Tang Code but not established in its own terms.
なお、律も併せて制定されたとする説（飛鳥浄御原律令説）もあるが、律は制定されず、唐律が適用されたとするのが通説である。