Electronic processing of invoices with no purchase orders

An electronic invoicing system performs an integrated method of processing both purchase order based electronic invoices and electronic invoices not associated with a purchase order or transaction receipt. A portal is provided by the system. The portal has respective views for a supplier submitting non-PO based type electronic invoices not associated with a purchase order or transaction receipt, and a user of an enterprise submitting and/or reviewing non-PO based type electronic invoices not associated with a purchase order or transaction receipt. An administrator of the enterprise configures electronic invoice types and processing parameters specific to said electronic invoice types not associated with a purchase order or transaction receipt. A submitted non-PO based type electronic invoice of a configured electronic invoice type is processed in accordance with the processing parameters configured by the administrator for that electronic invoice type.