Even though I put a little disclaimer in the text field in the invoice, I still have customers paying invoices early. The reason I want this is because once they pay, I can't change the invoice any longer. The other reason is I would like to keep a more accurate account of sales per week. So if their event isn't for 3 more weeks, I'm getting the sales report then, instead of when the event actually takes place.
We either need to be able to give a window of when the customer can pay, or be able to open "closed" invoices.
