This pipelet is used to set one or more price books to be considered by the product price lookup. The information is stored in the user session and valid until the next execution of the pipelet or on session expiration. If applicable price books are set by this pipelet, the price lookup does only use these price books to find the best price for the customer. No other price book - whether assigned to the site or not - is used by the price lookup. Price books set by this pipelet do not have to be assigned to the site in order to be used by the price lookup.