Fall release of Dynamics 365 for Operation is coming with feature to Punch-out to external supplier web site and get item and pricing details and create purchase requisition.All the suppliers who support cXML punch-out supports receiving purchase orders and sending invoices using cXML protocol. True value of the cXML lies in delivering purchase orders once approved to suppliers and getting invoices through cXML protocol. It will be great to have end to end implementation of cXML from purchase requisition to invoice to get full value of cXML integration.