+OPTIONS may include:
+- part_item: a part_pkg or part_fee object to be used as the package/fee
+ definition.
+- location: a cust_location to be used as the billing location.
+- cancel: true if this package is being billed on cancellation. This
+ allows tax to be calculated on usage charges only.
+
+If not supplied, part_item will be inferred from the pkgnum or feepart of the
+cust_bill_pkg, and location from the pkgnum (or, for fees, the invnum and
+the customer's default service location).
+