How does the duplicate detection work?

To prevent fraud, Klippa uses automatic detection of duplicate invoices. We use a few techniques to mark a transaction as a possible duplicate:
We look at the document, whether we have seen the exact same document results before in our system
We look at the combination of certain fields

Invoices

We mark as duplicate if 2 out of 2 fields are the same:
Invoice number + merchant
Invoice number + amount

Expenses

We mark as duplicate if 3 out of 4 fields are the same:
Merchant
Invoice number
Amount
Date

Info: We also check the OCR results (so if someone edits the fields it’s still flagged)

Tip: When a transaction is flagged as possible duplicate, you can click on the description given in bold letters within the notification to open the possible duplicate transaction

Example of possible duplicate transactions

Notification 'possible duplicate of X on date Y' when opening the invoice.



Notification 'possible duplicate of X on date Y' in the overview of all invoices.


Note: Despite the notification of a possible duplicate, an invoice can still be exported or booked.

Updated on: 21/03/2025