(1) For the purposes of this section, assume that the trust is an * AMIT for the discovery year.
(2) If the trust has an * under or * over of a character in the discovery year for an earlier income year when the trust was an * AMIT, work out the extent to which the under or over:
(a) increases the amount of the AMIT's * trust component of that character for the discovery year; or
(b) decreases the amount of the AMIT's trust component of that character for the discovery year.