Our state's sales tax forms have separate breakouts for totals of nontaxable sales from freight and services. So I have set up tax codes for various flavors of non-taxable items in Quickbooks, as an attribute of those line items. This very nicely allows the detail reports that are reached from the sales tax payable report to break out those categories of non taxable sales and provide a subtotal.
My problem is that the tax codes for these line items is being overidden by the tax code assigned to the customer. If the customer has a tax code of Non, then *every* line item in that customer's invoice is being forced to the value Non. Is there any way that for certain kinds of non taxable sales codes I could force them to preserve their values and not get overwritten by the default customer tax code value?