20Restriction on enforcement of arrears under maintenance order registered in Scotland
Where a maintenance order is for the time being registered in the sheriff court under this Part of this Act, a person shall not be entitled, except with the leave of the sheriff, to enforce, whether by diligence or otherwise, the payment of any arrears due under the order, if either—
(a)the sheriff has made a provisional order under section 9 of this Act revoking the said maintenance order and the arrears accrued after the making of the said provisional order, or
(b)the arrears accrued before the commencement of this Part of this Act;
and on any application for leave to enforce the payment of any such arrears, the sheriff may refuse leave, or may grant leave subject to such restrictions and conditions (including conditions as to the allowing of time for payment or the making of payment by instalments) as he thinks appropriate, or may remit the payment of such arrears or of any part thereof.