“Career executive assignment” means an appointment to a high administrative and policy influencing position within the state civil service in which the incumbent’s primary responsibility is the managing of a major function or the rendering of management advice to top-level administrative authority. Such a position can be established only in the top managerial levels of state service and is typified by broad responsibility for policy implementation and extensive participation in policy evolvement. Assignment by appointment to such a position does not confer any rights or status in the position other than provided in Article 9 (commencing with Section 19889) of Chapter 2.5 of Part 2.6.