Authority to approve travel on official state business and approval of claims or vouchers for reimbursement of travel expenses shall be in conformity with Section 34.68 of Title 62 of the Oklahoma Statutes, or as may be provided in future legislation. Approval of a travel claim or voucher, as provided in that section, shall constitute authority for the travel set forth in such claim or voucher. Claims or vouchers for reimbursement for expenses incurred in official travel shall not cover more than one (1) fiscal year.
Okla. Stat. tit. 74, § 500.3