A Transfer separates two parts of the deal:
the prepaid value the Seller has already paid for; and
the amounts that are still payable to the Vendors.
The Seller decides what they want to receive for the prepaid value they are transferring to the Buyer.
If the Seller offers the Buyer a saving, that saving comes from the Seller’s prepaid value — not from the Vendor.
Any remaining Vendor balances continue to be payable under the relevant Vendor’s terms and payment schedule.
Why this matters
The Seller’s price is not the same thing as the total remaining cost of the event.
A Buyer may therefore pay the Seller for value that has already been paid for, while still being responsible for amounts that become due to the Vendors later.
The Vendor does not have to fund the Seller’s discount or reduce the amount still due for their service simply because the client changes.
What should I check?
The Deal Specification shows what has already been paid and what remains payable to the Vendors.
Use those figures to distinguish:
the prepaid value being transferred by the Seller; and
the remaining Vendor balances connected with the event.