Division 19 applies in relation to an * increasing adjustment that an insurer has under section 78 - 18 as if:
(a) payments of excess under an * insurance policy to which the adjustment relates were * consideration for a * taxable supply that the insurer made; and
(b) the adjustment were the GST payable on the taxable supply; and
(c) any refund of that payment of excess made by the insurer were a reduction in the consideration for the supply.