How to handle deferred revenue as invoices, when we got full payment prior to due dates

 Hi Folks,

We are using Deferred revenue concept, few customers will pay full invoice amounts prior to revenue recognizition.

How to handle this situation in Oracle Receivables.

Ex:- We have created one sales Invoice with amount 12000 USD, where as revenue should be recognize by monthly i.e Jan-12- Revenu----1000, FEB-12-Revenu ------1000, 

We are giving some discounts to customers in this process, If customer pay full amount with in 3rd month i.e MAR-12, we can offer some discount, so due to this, customer are paying full amount in MAR-12, where as system is not allowing to apply full amount against Invoice. so please explain how we can handle this situation.