Duplicate invoice numbers, no warning
QuickBooks 2010 is not warning me about duplicate invoice numbers, even though the "warn about duplicate bill numbers from same vendor" preference is checked
QuickBooks 2010 is not warning me about duplicate invoice numbers, even though the "warn about duplicate bill numbers from same vendor" preference is checked


"Warn about duplicate bill numbers from the same vendor" works when entering vendor bills. To warn about duplicate customer invoices, you must check the "Warn about duplicate invoice numbers" in the Sales & Customers preferences.
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The problem is that I have the "warn about duplicate bill numbers from same vendor" preference checked, but it isn't warning me


You may have a faulty installation. You should contact tech support.