an Entity references as follows:
Invoice Processing : involves the handling of incoming invoices from arrival to payment. Invoices have many variations and types. In general, invoices are grouped into two types: 1. Invoices associated with a company's internal request or purchase order (PO-based invoices) and 2. Invoices that do not have an associated request (non-PO invoices). In general, both types of invoices are processed by a company's accounts payable department. The process in which a supplier invoice is validated and paid is also known as the purchase-to-pay cycle.