1 . ACTION FOR A DECLARATION OF NULLITY - ACTS OF THE EUROPEAN PARLIAMENT - ACTION BROUGHT BY A NATURAL OR LEGAL PERSON UNDER ARTICLE 38 OF THE ECSC TREATY - INADMISSIBILITY ( ECSC TREATY , ART . 38 ) 2 . ACTION FOR A DECLARATION OF NULLITY - ARTICLE 173 OF THE EEC TREATY - NATURAL OR LEGAL PERSONS - ACTS OF THE EUROPEAN PARLIAMENT - ADMISSIBILITY - CONDITIONS - LEGAL EFFECTS VIS-A-VIS THIRD PARTIES ( EEC TREATY , ART . 173 )