An amendment or repeal of any provision of this Act shall be made only following an
actuarial determination of its effect on the soundness of the system's design as well
as its effect on the cost of the system, and disclosure of such information to all
interested persons. No amendment or repeal of a provision of this Act shall affect
in any way the benefits then being paid to members, survivors, contingent annuitants
or beneficiaries or benefits based on service completed prior to the date of such
amendment or repeal, except as provided in Section 1.17; provided, however, that in determining such accrued benefits payable to members
of Division A, the average base earnings and the average excess earnings shall be
determined as of the date of the amendment or repeal, as the case may be, and in determining
such accrued benefits payable to members of Division B, the credited earnings shall
be determined as of the date of the amendment or repeal, as the case may be.
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