A. If a school district, together with either (i) an educational service center that serves that school district and is established under Section 2-3.62 of the School Code or (ii) another governmental entity that exists under a cooperative or joint agreement to which that school district and one or more other school districts are parties, concurrently employ the same individual and compensate the individual through a common paymaster that is either the governmental entity or school district, the common paymaster is considered to be the employer of the individual.
     B. Notwithstanding Section 1405, for the one-year period following the effective date of this amendatory Act of 1994, an educational service center described in subsection A or another governmental entity that exists under a cooperative or joint agreement to which 2 or more school districts are parties may elect to make payments in lieu of contributions, effective with the date that the entity became liable under this Act. The right to elect under this subsection is conditioned upon the payment, within 60 days of the election, of any payments in lieu of contributions that are based on the payment of benefits within any calendar quarters completed no more than 4 years before the date of the election.