6. Where—
(a)no maintenance assessment is in force and an application for such an assessment is made in one territory and another such application is made in the other territory in respect of the same qualifying child or children and the same person with care and absent parent or parents or person treated as such; and
(b)but for the fact that the person with care, and the absent parent or parents or person treated as such reside in different territories the provisions regarding multiple applications made under the provision for Great Britain or the provision made for Northern Ireland would apply,
those provisions shall have effect to determine which application shall be proceeded with.