A system and method for performing Electronic Invoice Presentment and Payment (EIPP) processing at a line item granularity is disclosed. A server enables a purchasing entity to designate approvers for selected departments within the purchasing entity. The server receives from a providing entity invoices...http://www.google.de/patents/US20020184121?utm_source=gb-gplus-sharePatent US20020184121 - Methods and system for performing business-to-business electronic invoice presentment and payment with line item level granularity
