Replying to [shazbat]:
Hope I can help you with this 4 ways of making payments. It's how they do in some companies.
When a vendor sends a bill for goods or services provided, departments have one of four ways to request payment.
Parked Invoice - You enter the invoice into SAP, write the SAP document number in red in the top right corner of the original bill and forward it to Accounting for processing.
Direct Pay - You send the original bill with an authorized department signature and the cost center to charge to Accounting for processing.
Framework (an open-ended or blanket purchase order) - You send the original bill with the framework number written on it, an authorized department signature and the cost center to charge to Accounting for processing.
Purchase Order - You send the original bill with the purchase order number written on it, a goods receipt number and an authorized department signature to Accounting for processing.