(1) You have a decreasing adjustment if:
(a) section 75 - 12 applied to working out the * margin for a * taxable supply of * real property that you made; and
(b) after you made the supply, a further amount of the * consideration was paid for the earlier supply referred to in that section.
(2) The amount of the decreasing adjustment is an amount equal to 1 / 11 of the further amount of the * consideration paid.