129.—(1) Subject to paragraph (2), a payment of child support maintenance is to be treated as paid—
(a)in the case of a payment which is due to be made before the benefit week in which the claimant first became entitled to an income-based jobseeker’s allowance, on the day in the week in which it is due to be paid which corresponds to the first day of the benefit week;
(b)in any other case, on the first day of the benefit week in which it is due to be paid or the first day of the first succeeding benefit week in which it is practicable to take it into account.
(2) For the purposes of paragraph (1), where a payment of child support maintenance is due to be made under an instalment or other agreement on a date which is not the date on which it was originally due under the maintenance assessment (the original date), it shall be treated as if it was due to be made on the original date.