Event Billing for a Cost Reimbursable Contract

Summary:

If we have created an Event for an Advanced Payment but the Award/Contract is Cost Reimbursable how do we handle the Bill Plans in Contract Billing?

We received a advanced payment from a Sponsor which we created an Event with a type/class 'Upfront Cash'. But we do not know how to set up the SLAs in the Contract Management when we run Generate Revenue when we created the Event, SLAs in the Receivables Module when the Invoice Contract has been transferred and accepted, SLAs in the Receivables module when the Advanced Cash Payment is applied to the Contract Invoice.