There must be a financial impact. Configure your system such that the billing document posts along the lines of:
Dr Customer
Cr Downpayments (B/S)
This entry shows an offsetting asset (the posting to the customer) with a liability (reflecting that the downpayment is owed to the customer).
When the customer is billed for the completed product, invoice as per normal, so that the full sale value shows as revenue.
Use an FI entry to move the downpayment amount back to the customer's account to reflect the fact that he owes for the sale amount less the downpayment received.
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