If you have any * adjustments that are attributable to a tax period applying to you, alter your * net amount for the period as follows:
(a) add to the amount worked out under subsection 17 - 5(1) for the period the sum of all the * increasing adjustments (if any) that are attributable to the period;
(b) subtract from that amount the sum of all the * decreasing adjustments (if any) that are attributable to the period.
For the basic rules on what adjustments are attributable to a particular period, see Division 29.