In 813, after 'the Doen Kaicho Rules' (rules on official certificates of entrance into the priesthood and certificates of reception of Buddhist commandments) were revised, it became a norm to add the date of the reception of the religious precepts at the end of a Doen official certificate so that the certificate would serve as a Kaicho certificate.
813年（弘仁4年）、「度縁戒牒の制」が改正されて以後、度縁の末尾に受戒年月日を注記し、戒牒として機能させることとなった。