If a minority business enterprise is awarded a contract by this state pursuant to the Oklahoma Minority Business Enterprise Assistance Act, said business shall not assign the rights of the contract to any other business without prior written approval of the State Purchasing Director of the Office of Management and Enterprise Services verifying that such business is also a minority business enterprise certified as such by the Office of Management and Enterprise Services. Any such assignment made without the prior written approval of the State Purchasing Director of the Office of Management and Enterprise Services shall be deemed unlawful pursuant to paragraph 5 of subsection A of Section 85.45h of this title. Such unlawful assignment shall be voidable by the Office of Management and Enterprise Services.