All specifications shall be drafted so as to ensure maximum practicable competition and fulfill the requirements of state agencies and local public bodies. In preparing specifications, if, in the opinion of the state purchasing agent or central purchasing office, a proposed component is of a nature that would restrict the number of responsible bidders or responsible offerors and thereby limit competition, if practicable, the state purchasing agent or central purchasing office shall draft the specifications without the component and procure the component by issuing a separate invitation for bids or request for proposals or by entering into a sole source procurement.