This would be a fantastic way to give your customers a bear-hug and slowly pull them into a full ERP system.

I have personally seen myself and other business owners issue invoices that are unconnected to any system early on - just generating it using some ill-suited tool like Word.

But once your customer enter their invoice data in Invoice Dragon, it's a simple matter for you to set up a "payment due" reminder for them. And then add on outstanding balance per customer. And so on, and the next thing you know, it's an ERP!