(Section 7)
6. Where the employer is required to comply with 2 or more attachment of earnings orders in respect of the same debtor, then on any pay-day the employer shall, for the purpose of complying with Part I of this Schedule—
(a) deal with the orders according to the respective dates on which they were made, disregarding any later order until an earlier one has been dealt with;
(b) deal with any later order as if the earnings to which it relates were the residue of the debtor's earnings after the making of any deduction to comply with any earlier order.