Deafult "Expense" line type for Punch out requisitions

We are enabling punch out feature with one of our suppliers. We are using "Model 2b: Punchout from Oracle iProcurement Directly to Supplier-Hosted Catalog (cXML)". When doing the punch out, the requisition that is created in Oracle has line type as "Inventory". We would like this to default to "Expense" since these are not related to inventory purchases. I tried changing POR: Goods Line Type profile from "Inventory" to "Expense" and then the punch out requisitions lines had the line type of Expense. But changing this profile also impacts the requisitions created from Catalogs that had inventory items which we