All boards, commissions, officers and heads of departments of the state authorized to approve disbursements for indebtedness or expenses may designate the secretary, or some officer of each board or commission, or some representative or deputy of such officer or head of department who is under bond to the State of Oregon to approve those disbursements, provided that the indebtedness or expense has been theretofore authorized by such board, commission, officer or head of department. Such board, commission, officer or head of department shall file with the Oregon Department of Administrative Services a statement designating such secretary, officer, representative or deputy together with a sample of the designated person‘s signature. [Formerly 291.472; 1967 c.454 § 16]