Finance Pre Payments means payments made before the day it is due.
The question is how you treating the payment in your system.
If you treating it as advance received from customer, you can use the following transactions
F-29 Post Customer Down Payment
F-30 Post with Clearing
You can also treat it is noremal customer paymnet.You can use the T.code F-28 or F110.
Please let me know if you need more information.