# Duplicate detection

> Algorithm flagging receipts with identical date, origin, destination, and distance.

**URL:** https://quilometragem.com/glossary/duplicate-detection

**Summary:** Algorithm flagging receipts with identical date, origin, destination, and distance.

- Duplicate detection is the rule set that flags suspicious receipts: same date plus same origin plus same destination plus same distance.
- A simple key-field hash catches 95% of accidental duplicates.
- Advanced systems detect variants: distances rounded to the same number, word-for-word identical purposes, suspicious temporal patterns.

Duplicate detection is the rule set that flags suspicious receipts: same date plus same origin plus same destination plus same distance. A simple key-field hash catches 95% of accidental duplicates. Advanced systems detect variants: distances rounded to the same number, word-for-word identical purposes, suspicious temporal patterns.