Prior to receiving per diem compensation under this division, a judge of the court of appeals shall certify, in writing, that he did sit with the justices of the supreme court, or did perform any duty incident to the sitting, on the days for which the per diem compensation is sought. The certificate then shall be approved by the chief justice of the supreme court or, in his absence, by the acting chief justice of the supreme court and that approval is sufficient authority for the drawing of a warrant.
R.C. §141.11