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QuickBooks has the option to warn you when entering a duplicate bill number. You'll want to make sure that the feature is turned on. Here's how:
After turning on the option, you'll now get a prompt that the bill number you're entering is a duplicate.
As always, you can visit our QuickBooks Community help website if you need tips and related articles in the future.
Please know that I'm just a reply away if you need any further assistance managing your bills or vendor transactions. Have a good one!