Product Advertising API
Developer Guide (API Version 2013-08-01)

Search Indices, Parameters, and Locales

There is one further restriction on the use of parameters in an ItemSearch request. The search index values that can be used in an ItemSearch request vary by locale. For example, the Baby and Beauty search indices are available in the US but not in the UK locale. An error is returned if you use a search index value that is not supported in a locale. The limitations on the use of search indices by locale therefore also limits the use of ItemSearch parameters.

For a complete list of ItemSearch parameters supported in each search index and in each locale, see Locale Reference for the Product Advertising API.