I am trying to convert a Sales Order to an Invoice; I go to my Sales Orders, choose my Customer/Job and click Covert to Invoice and get "This invoice number was already used. Try a different one to continue."  I have checked our invoices, I don't have any repeated Invoice numbers.  When you "Convert to Invoice" you don't get to choose any Invoice number, QBO converts it for you.  This is a problem.  I've read through the forum and tried troubleshooting outside of QB, to no avail. I really wish the QBO team worked with the Desktop team.  QBO does not function nearly as intuitively as Desktop (Enterprise). I've worked in Quickbooks for the better part of 20 years.  This is not good.