The advanced charges report are Charges (Items) posted on folios for bookings where the Arrival Date is either TODAY (and check in has yet to occur) or still in the FUTURE. Thus, this lists all 'current liabilities' where you have booked a revenue category (such as a Spa service) but have yet to provide the service.
If there has been a receipt of Payment (either via an online booking or an 'apply payment' event), and the booking or group booking has an arrival in the future, that amount will appear on your Advanced Deposits Report.
When the booking checks in, these Charges disappear from your Advanced Charges Report. Thus, checking in a booking clears the amounts that had been listed as 'Advanced Charges'.
Here is an example:
On February 10 you take a booking for March 9 and you book a Spa appointment, so you place a Charge on the Folio for $200 and 'apply charge' to the booking. Your Advanced Charges Report will list $200 from February 10 forth.
On March 9, the booking is checked in. At this point, the Advanced Charges Report no longer shows the $200. It has been removed from your Advanced Charges Report because it is now 'governed' by your booking.
This is key to understanding the Advanced Charges Report.