When talking about “e-invoicing”, the exchange of machine-readable documents in XML format is meant. This can happen either via an e-invoicing or supplier portal, or simply, via email. From e-invoices the data can be transferred directly and automatically to the ERP system, document capture is no longer necessary. This eliminates one of the biggest sources of errors in AP processes. PDF files do not count as e-invoices in a narrow sense, because they still need to go through OCR.