I am trying to update just the ship-to address on a series of invoices. My excel import file includes columns for the customer, Invoice Number and shipto1 through shipto5. when I try to create the mapping, I'm told that the item reference is required even though the ship-to is on the header of the invoice. I ignore this and create the mapping anyway. When I go to import, I get an error on the records but without any further explanation. Can someone help me with this?