This doesn't address the question.  Of course the duplicate invoices impact my business.  If a duplicate isn't paid, and I've lost all tracking of a duplicate invoice because it is a duplicate, then I've lost that money and it DOES impact my revenue and taxes!  I even have an invoice that was triplicated.  This company needs to figure out how to eliminate duplicate/triplicate invoices.  If it's pilot error I need to know what I'm doing to cause it.  Not only does it have a monetary impact it has a perception impact by those customers I have to go back to and say, I can't track your invoice - I lose credibility because of this program.  I am researching others.  I don't need other b.s. articles to read.  I need quickbooks to fix the issue - quickly.  In addition, if I'm using the poorly designed "reports" I can't accurately track revenue by customer.  I do not manually enter an invoice number - ever.