Okla. Stat. tit. 62, § 34.73
A "proper invoice" means one which is complete in all requirements necessary for processing it for payment in accordance with the terms of appropriate contracts and applicable state or federal statutes.
Laws 1983, HJR 1010, p. 1167, § 3, emerg. eff. May 24, 1983; Amended by Laws 2009, HB 2015, c. 441, § 64, emerg. eff. July 1, 2009 (superseded document available); Renumbered from 62 O.S. § 41.4c by Laws 2009, HB 2015, c. 441, § 64, emerg. eff. July 1, 2009.