Customs Classification: One of the Cornerstones of the Single European Market, But One Which Cannot Be Exhaustively Regulated - Common Market Law Review View Customs Classification: One of the Cornerstones of the Single European Market, But One Which Cannot Be Exhaustively Regulated by - Common Market Law Review Customs Classification: One of the Cornerstones of the Single European Market, But One Which Cannot Be Exhaustively Regulated 28 4 Common Market Law Review