An item that is always included when this item is sold. When a new line is created on a shipment, a line is automatically created for each of the included items.
You must supply either an id or a number of the trade item. You must supply either an id or a number of the included trade item.
Unique identification of this item across all areas and subscriptions.
The SKU of the included item.
SKU of the item that is automatically included.