...
On Retrieve after Cancellation you can see the total price of the booking and the total price of the cancellation.
RoomStaysExcursionRates/RoomStayExcursionRate/RoomRatesRates/RoomRateRate/Total/@AmountAfterTax - is the total price of the booking (even if the reservation has already been cancelled for free). This Amount has the same value that we show on Reservation.
RoomStaysExcursionRates/RoomStayExcursionRate/Total/@AmountAfterTax - is the actual total price for the booking. This Amount is the price of the cancellation.
...