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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:

  1. We look at the document, whether we have seen the exact same document results before in our system
  2. 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


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



  1. 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

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