(1) You have a decreasing adjustment if:
(a) you become * registered or * required to be registered; and
(b) at that time, you hold stock for the purpose of sale or exchange, or for use as raw materials, in * carrying on your * enterprise; and
(c) you had acquired the stock solely or partly for a * creditable purpose.
(2) However, this section does not apply if:
(a) you were entitled to an input tax credit for the acquisition; and
(b) you have not had a * increasing adjustment under Division 138 (cessation of registration) relating solely or partly to the stock.
(3) The amount of the decreasing adjustment is an amount equal to what would have been the * previously attributed input tax credit amount for the acquisition if you had been * registered at the time of the acquisition.