This error may occur if ReconPro vendor, employee, or client has the same name as another entity in QuickBooks, for example, when you export invoice for client “John Smith” while in QuickBooks you already have a vendor or an employee whose name is “John Smith”, i.e. QuickBooks doesn’t allow creating a vendor, an employee, and a client with the same name.

To fix the issue, rename the duplicate vendor, employee, or client either in ReconPro or in QuickBooks, and try to export invoices again.