(2) The state deferred compensation plan established by ORS 243.401 to 243.507 supplements all other retirement and pension systems established by the State of Oregon, and participation by an eligible state employee in the state deferred compensation plan shall not cause a reduction of any retirement or pension benefits provided to the employee by law. [1977 c.721 §6; 1997 c.179 §12; 2011 c.722 §18]