Can I prevent a customer from paying an invoice early?

[rococomac]

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. 

[Minion]

Hey @rococomac 

I'm not sure if your situation is the same as this situation and maybe  but this idea from Doran may be able to work for you?  

Let us know if that would work for you.