21. If the actuarial valuation used to determine the value of the additional obligations arising from an amendment to the pension plan shows that the degree of solvency of the plan is less than 90%, a special amortization payment must be paid into the pension fund, payable in full on the day following the date of the valuation and at least equal to the lesser of:(1) the amount corresponding to the value on a solvency basis of the additional obligations arising from an amendment to the plan considered for the first time during the valuation; or
(2) the amount corresponding to the assets lacking for the plan’s degree of solvency to be 90%.