HI Colleen, We are using NAV as well and are trying to map out all of the issues with data migration from/to NAV. We intend to use the existing API's that Concur offers, however, there are other mater data items that we'd need to import before even thinking about migrating PO's into the system. I'm wondering if you might have a couple of minutes to "talk"? I'd like to get your feedback as a NAV using trying to implement Concur Invoice. I've asked repeatedly with our SAP Concur rep to suggest an existing customer to talk to however they've failed to even acknowledge my request. So I'm reaching out to you personally. My email address is slorrain@mcasphalt.com. Thanks - Good luck with your project.