How to Track Donor/Grant Advances at Project Level Without Creating AR Invoices?

Our Current Process (Using Contract Billing Events):

1. We create an Advance Event in the Contract.
2. Contract Billing generates an Advance Invoice, which posts as:
   • Dr AR Trade Receivable
   • Cr Prepayment Liability (or Unearned Revenue)
3. Donor pays the advance, so we create a Customer Receipt in AR.
4. Later, when actual project costs occur and revenue is generated, we create another Billing Event and AR invoice.
5. Then we create a Prepayment Application Event to apply the advance, which results in:
   • Dr Prepayment Liability
   • Cr AR Trade Receivable

Problem:

This method creates multiple AR invoices that appear as Trade Receivables.

Is there a supported method to record donor advance funding