Each line shows the Date/Time the rounding was applied, which is the moment the cash payment was taken, the Invoice No. it was applied to, the Original Amount of the cash payment as calculated, the Rounded Amount the customer actually paid, the Difference between them (negative when rounded down, positive when rounded up), the Direction, Up or Down, Adjusted In, which tells you whether ARM absorbed the cents in the invoice's Labor or Parts total (labor when the invoice has labor, otherwise parts), and Applied By, the ARM user who took the payment. The TOTALS row sums the Original Amount, Rounded Amount and Difference columns for the lines listed. If a rounded cash payment is later deleted, ARM reverses the rounding and removes its line from this report.
Penny rounding is switched on or off for the store in System Setup Tools under the master configuration; when it is off, no lines are written and this report stays empty. The Add To Favorites switch beside the heading saves the report under Favorites on the Reports page. Which reports you see depends on your admin group permissions.