To find out how much corrections (a.k.a. reversals) were made on transactions with an event date in August (including corrections made to these commissions in September) the Commission Detail by Event Date report (either for All or just Corrected) will show in the amounts and totals in the Corrected column.

Report Type: Commission Detail
Filter Results By: Corrected (change from “Correct Status: All”)
Time Frame: Aug. 2005 (“last month”)
Keep “Event Date” Selected