Online Bookings: system refund functionality is not working

[OsaVS]

Path: channel/manage_booking_by_date.xhtml

Description
There is an issue in the Online Booking refund flow on the manage_booking_by_date page (Refund tab), where the refundable total is calculated incorrectly, causing the refund process to terminate.

Issue
For Online Bookings:

• bookingControllerViewScope.refundableTotal is always calculated as 0
• This causes the refund process to terminate prematurely

Details
For Online Booking, in the Refund tab:

• selectedBillSession.bill.referenceBill.billFeesWithoutZeroValue are loaded as BillFees for refund.
• The rendered BillFee.tmpChangedValue values are should be used to determine the refund amount.

However,

• bookingControllerViewScope.refundableTotal is calculated using
  selectedBillSession.getBill().getBillFees().tmpChangedValue

This creates a mismatch because:

• The UI uses reference bill fees
• The backend calculation uses current bill fees

Related Methods: (BookingControllerViewScope)

• calRefundTotal()
• checkRefundTotal()
• channelBookingRefund()