To adjust an event:
If the Events dialog box is not open, see "Working with Events".
In the Events dialog box, select events and click Adjust.
The Event Adjustment dialog box appears.
Select one of the following:
Adjust amount and tax
Adjust amount only
Adjust tax only
For Adjustment, enter the amount or percentage you want to adjust.
To increase the amount due, enter a negative number.
For Effective, select the date.
From the list, select a reason.
(Optional) Enter a note.
Click OK.