It was subordinated to Chokunin (imperial appointment), Sonin (appointment by Dajokan [Grand Council of State] upon imperial approval) and Hannin (appointment by Shikibu-sho [the Ministry of Ceremonial] upon approval of Dajokan), and was mainly used when conducting Bunin for Zonin (lower-ranking government official).
勅任・奏任・判任の下位に置かれており、主に雑任を補任する際に用いられる。