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Warn about duplicate invoice numbers

This preference causes QuickBooks to warn you when you try to record an invoice that has the same number as a previous invoice.

The warning causes QuickBooks to take more time to record an invoice. This affects performance significantly if you have a large company file.

Where to find this preference:

Open the sales and customers preferences.

Opening sales and customers preferences
10/18/2017 8:24:35 PM
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