(1) In these arrangements—
(a) references to a maintenance assessment shall, in relevant cases, include references to a maintenance calculation;
(b) references to an absent parent shall, in relevant cases, include references to a non-resident parent; and
(c) references to cases where an application for a maintenance assessment is made shall, in relevant cases, include references to cases where an application for a maintenance calculation is treated as having been made.
(2) In this Article, “relevant cases” means cases for the purposes of which section 1 of the 2000 Act has come into force or cases for the purposes of which section 1 of the Child Support, Pensions and Social Security Act (Northern Ireland) 2000 has come into operation.