I have found an invoice discrepancy in the past. I was doing a final review of the invoice when I noticed an odd detail with the dates. An earlier date was on a row above a later date, which was very odd at my last job. I decided to pull out the original documents in order to compare the two. This analysis allowed me to realize the date had been entered into the invoice incorrectly. While this may seem like a minor issue, it can lead to troubles during tax review time.