++++ 1 . European Communities - Institutional balance - Implications - Maintenance of the division of powers - Judicial review ( EEC Treaty, Art . 164; EAEC Treaty, Art . 136 ) 2 . Action for annulment - Parliament' s right to bring such an action restricted to defence of its prerogatives ( EEC Treaty, Art . 173; EAEC Treaty, Art . 146 ) 3 . Parliament - Prerogatives - Participation in the legislative process - Restricted by the Council' s choice of legal basis for an act of secondary law - Admissibility of Parliament' s action for annulment ( EEC Treaty, Arts 100a and 173; EAEC Treaty, Arts 31 and 146 )