Up until CRM6, this was an available solution for our requirement.
Sales Order Processing One-Step Business in CRM Web Channel
"You can use this business process to integrate your CRM Web Channel Web shop into another customer's procurement system, for example SAP Enterprise Buyer Professional (SAP EBP). In doing so, you enable the customer to purchase goods from your catalog using their own purchasing systems, which are fully integrated into their financial and organizational systems."
Does anyone know if this is still available in the CRM7 Web Channel? We had this working in our CRM4 setup to one of our customers SRM system, but need an OCI compliant solution in a new platform.