Does your Supplier/Vendor ask you to send Purchase Orders in cXML format?
What is a cXML File?
CXML is just a commerce XML protocol created by Ariba but is free to use by all
PunchOut is a Business to Business protocol for interactive sessions managed across the Internet, a communication from one application to another, achieved through a dialog of real-time, synchronous cXML messages, which support user interaction at a remote site.
This protocol is most commonly used today in the form of Procurement PunchOut, which specifically supports interactions between a procurement application and a supplier’s eCommerce web site and possibly includes an intermediary for authentication and version matching.