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Items That Do Not Have Offers
There are two kinds of items returned by Product Advertising API:
Regular items
Parent items
A parent item is an abstraction of a collection of items. For example, shirt is a parent item. A shirt that is a specific size and color would be a child of the parent item, which is called a regular item. Each regular item has an item identifier, such as an ASIN. That means that a red, large shirt would have a different ASIN from the same shirt that is blue and size large. The child items are also called variations.
Because a parent item is an abstraction, it cannot be sold so it does not have an OfferListingId.
