An offer (the final offer ) to change the consideration for supplies, that are made on or after 1 July 2005 and that are specifically identified by an agreement of a kind referred to in subsection 13(1), is an arbitrated offer if:
(a) the supplier has, in accordance with section 15K, made an offer (the initial offer ) to the recipient of the supplies to change the consideration; and
(b) change to the consideration has been arbitrated in accordance with section 15L; and
(c) the supplier makes the final offer in accordance with section 15M.