In many ways, overpayments in an organisation’s ERP system are intangible, not noticed – and if left for too long – unrecoverable. It remains a fact that if you’re processing over 25,000 invoices a year, you will also be processing duplicates. The supplier may highlight the error, but often it’s either overlooked by both parties, or deliberately ignored. In the latter case, it’s interesting to note that this is often not thought of as fraud by the guilty party. Of course the onus should be on the buyer to ensure that their payment process is correct, but if the supplier notices, and then does nothing, then that is another issue entirely.