> ## Documentation Index
> Fetch the complete documentation index at: https://help.liftai.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Resolve a duplicate invoice warning

> Why a duplicate-invoice warning appears when you save an invoice and how to confirm or cancel it.

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.

<Note>
  This is a check at **save/upload time** only. It doesn't appear while you're reviewing an already-saved invoice.
</Note>

## Confirm or cancel

When the dialog appears, you have two choices:

<Steps>
  <Step title="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.
  </Step>

  <Step title="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.
  </Step>
</Steps>

<Tip>
  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.
</Tip>

## Related

* [Review an invoice](/invoices/review-an-invoice)