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When you save or upload a new invoice, LiftAI checks whether one like it already exists. If a new invoice’s number matches an existing invoice from the same service provider, a Duplicate Invoice Detected dialog appears before the invoice is saved, so you don’t accidentally enter the same invoice twice.
This is a check at save/upload time only. It doesn’t appear while you’re reviewing an already-saved invoice.

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Confirm or cancel

When the dialog appears, you have two choices:
1

Proceed Anyway

Choose Proceed Anyway if this really is a separate invoice that happens to share an invoice number with an existing one from the same service provider. The invoice saves as a new record.
2

Cancel

Choose Cancel if it’s a genuine duplicate or you entered something incorrectly. The dialog closes and nothing is saved, so you can fix the invoice number or other details — or stop entering it, if the existing invoice already covers it.
Before choosing Proceed Anyway, open the existing invoice to confirm it isn’t the same one. If it is, cancel instead of creating a second copy.