When any change accompanied by legal effect occurred, the party submitted gejo (a form of letter used by lower-class people to make a suggestion to higher ranking people) to kyoshiki (the Capital Bureau) or kokushi (provincial governor) (through Gunji [local magistrates], in many cases), and it was given kohan (公判) by kyoshiki or kokushi to certify it as kugen.
法的効力の伴う変動の発生に際して当事者が解状を京職または国司（郡司を経由することが多い）提出し、京職・国司がこれに公判を加えることで公験として認められた。