(a) A benefit enhancement provided for by § 24-7-1306 shall not be implemented if it would cause the Arkansas Teacher Retirement System's unfunded actuarial accrued liabilities to exceed an eighteen-year amortization.
(b) A benefit enhancement provided for by § 24-7-1306 shall not be implemented by the system until the unfunded actuarial accrued liability is reduced to a level less than an eighteen-year amortization.