The provisions of this article are intended to encourage career public service by granting reciprocal retirement benefits to members who are entitled to retirement rights or benefits from two or more retirement systems established under this chapter or from a retirement system established under this chapter and the Public Employees’ Retirement System, the State Teachers’ Retirement System, or a retirement system of any other public agency of the state that has established reciprocity with the Public Employees’ Retirement System subject to the conditions of Section 31840.2, and to delineate the financial obligations of each system and related political entity so that no system or political entity shall be liable for more than its just financial obligation.