---
title: "How Datamolino checks for duplicate invoices | Datamolino"
url: https://www.datamolino.com/guides/duplicate-invoices-datamolino/
description: "Understand identical-file and invoice-data checks, their folder scope, and how to handle a warning without creating another bill."
published: 2026-09-21
updated: 2026-09-21
source: "Datamolino website (www.datamolino.com), Markdown copy of the page at the URL above. Prices and product details can change; check the page before relying on them."
---

# How Datamolino checks for duplicate invoices

It can identify identical files before capture and compare captured invoice data within a folder. Review the warning against the source before importing or exporting another copy.

Last updated 21 September 2026 · 3 min read

## An identical file can stop before capture

When the same file arrives again in the same folder, Datamolino’s [identical-file detection](https://www.datamolino.com/features/#identical-file-detection) can identify it before normal capture. This is useful when a supplier sends the same PDF twice or a colleague forwards a message that has already been processed.

The check starts with the file. It does not replace a review of the invoice reference, supplier and amounts when the documents differ.

## Different files can represent the same invoice

The same supplier invoice can arrive as a revised PDF, a scan and an email attachment. Captured invoice-data checks help find those cases within the folder. Compare the original documents before deciding whether the second item is a duplicate, a credit, a correction or a separate purchase.

Two invoices can share a supplier, date and amount and still be separate transactions. Use the invoice reference and the actual source to resolve the warning.

## Folder structure affects protection

Duplicate checks are scoped to the relevant folder. Put one accounting entity and its intended document stream in a clear folder structure so that the team knows where invoices are expected to arrive. A copied invoice in a different folder needs the same review as any other new document.

## Resolve a warning without creating another problem

Open the existing document and the new source side by side. If they are the same invoice, keep the already processed record and remove the unnecessary intake item through your normal operating process. If they differ, record why and continue with the correct document.

Check Import History and document status before asking a supplier to send another copy. The [duplicate detection guide](https://helpdesk.datamolino.com/en/articles/15175347-duplicate-detection-how-datamolino-prevents-duplicate-imports) explains the product checks and the [folder guide](https://www.datamolino.com/guides/organise-client-folders-invoice-workflows/) covers routine intake.

## Help Centre instructions

- [Duplicate detection: how Datamolino prevents duplicate imports](https://helpdesk.datamolino.com/en/articles/15175347-duplicate-detection-how-datamolino-prevents-duplicate-imports)
- [Import history: track what was uploaded and when](https://helpdesk.datamolino.com/en/articles/15175351-import-history-track-what-was-uploaded-and-when)