The quotation is the payment plan where you can find the total of the amount you will need to pay with the related deadlines before you can book your check-in. The amount of the booking fee paid to reserve the room will result "already paid".
The invoice, on the other hand, is the official document with the reference number.
If you are already a DoveVivo tenant, consult the second page where you can find the explanation of the items present on the invoice and the FAQ with answers to all your questions.