Okla. Stat. tit. 62, § 35.6
A. On July 1, 2011, all appropriated and nonappropriated state agencies shall be required to use the following information technology services and systems operated and maintained by the Office of State Finance for all agency functions:
B. On July 1, 2011, all appropriated and nonappropriated state agencies shall be required to exclusively use the following programs, services, software and processes provided through the Integrated Central Financial System known as CORE and as implemented by the Office of State Finance and shall not utilize any programs, services, software or processes that are duplicative of the following:
Laws 2011, HB 1304, c. 296, § 6.