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On Retrieve after Cancellation you can see the total price of the booking and the total price of the cancellation.
RoomStaysTransferRates/RoomStayTransferRate/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.Tran
RoomStays/RoomStayTransfer/Total/@AmountAfterTax - is the actual total price for the booking. This Amount is the price of the cancellation.
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