This product is already restricted for this locale. For more details, see http://sellercentral.amazon.com/gp/help/25081
This error occurs when the shipping restriction you specify in your shipping overrides file or overrides feed (XML) is unnecessary because of an existing restriction. For example, the default shipping settings you have established in Seller Central may already restrict shipment to the locale you specified. To resolve this error, remove the unnecessary restriction from future submissions.