| CostBasis | Used to indicate what the cost is based on e.g., per Passenger, per Room, per Booking. Refer to OpenTravel Code List Charge Type (CHG). |
| Description | A description of an invoice item. |
| InventoryItemRPH | Used to associate a cost with a specific inventory item, e.g. a supplement for a flight leg. |
| PassengerRPH | Used to associate a cost with a specific passenger, e.g. a vegetarian meal supplement. |
| PriceTypeCode | Specifies what the invoice item is for. Refer to the OpenTravel Code Table Price Type Code (PRI). |
| Quantity | Used to define the quantity for an associated element or attribute. |
UnitCost