Pro Formas Invoices

[party_pete]

I want to give my customers the option of requesting a Pro Forma Invoice once they've placed their order online, so that they can issue me a cheque on receipt.

This is mainly when I'm selling to businesses and they need things processed through their purchasing dept.

What would be the best way to implement this?

[I-CC]

The option, Invoice with order which is a set payment option springs to mind.

The invoices can say this is not a VAT receipt, so that when you get the money, so send the goods along with the proper VAT receipt.