My staff has frequent needs to change the BillTo contact in many areas of iMIS. Unfortunately, this is not easy to do in the cloud version of iMIS. My current need is to change an event registration BillTo. I tried passing the ComboOrder back through the API with No Adjustment on all of the lines and a new BillToCustomerParty PartyId, and while the response looked promising, the data did not seem to update. Is there any way to update the BillTo contact through the API?