Setting Billing/Shipping addresses on Insert Salesorder in the SalesLogix Web Client

In a recent SLX Web project, it was requested that I add a contact lookup to the insert SalesOrder view, and when that was set, use the contact's address for the Shipping and Billing address in the SalesOrder. I was able to add a new Contact property to the SalesOrder and add the lookup to the insert SalesOrder view, but I wasn't able to reference the new property after it was set.