When your business is electronically connected to your suppliers, via a collaborative purchase order management software solution, supply chain management becomes a lot less complicated. Descartes Purchase Order Direct™ (Descartes P.O. Direct™) Software-as-a-Service (SaaS) is a unique combination of technology and information services that can improve the performance of your import supply chain by giving you real-time, continuous visibility into inventory, even before it reaches your warehouse.