What happens if the API version isn't specified?
This object has the following associated objects. If the API version isn’t specified, they’re available in the same API versions as this object. Otherwise, they’re available in the specified API version and later.
What is a SKU in product code?
The SKU for the product. Use in tandem with or instead of the ProductCode field. For example, you can track the manufacturer’s identifying code in the Product Code field and assign the product a SKU when you resell it. The type of product.
