Revenue Contingencies - Update Date Date on Acceptance

Hi

just wondering if anyone has met this scenario and how you addressed it.

Scenario:

1. Ship an Order
2. Revenue Contingency Rules - Customer Acceptance
3. Generate Invoice - scheduled process, Due date is calculated based on terms associated.
4. Customer Accepts the shipment - might be the next day or 2 months later....
5. Update the Due Date on the Invoice to the date of acceptance + terms

Its point 5 where I'm struggling - can't see a standard way to do this.

I know I can use AutoInvoice to calculate the due date based on offset days instead of the transaction date - but I can't seem to see a way to trigger a recalculation based on Acceptance date.