How to Handle Billing for prepaid Awards in Grants Management ?

For the Grants which were prepaid/money received, we told the customer to create a Receipt in AR, and account it. Once the client started incurring cost on it, we told them to Invoice it and apply against the receipt they already had.

For the Grants, for which they have not received payment, we told them to invoice it and send the Invoice to customer. Once they receive the payment, create a receipt in AR and then apply invoice to it. In both of the cases, we had "Cost Reimbursable" Bill Plan.

The Issue with this approach is not getting the correct amount in Federal Financial Report.