1 . OBJECTION OF ILLEGALITY - ACTS WHOSE LEGALITY MAY BE CHALLENGED-INDIVIDUAL DECISION - COMMISSION ' S FAILURE TO ACT NOT CHALLENGED SUBSEQUENTLY BY AN ACTION BEFORE THE COURT - EXCLUSION ( ECSC TREATY , ART . 36 , THIRD PARAGRAPH ) 2 . ECSC - PRODUCTION - STEEL PRODUCTION QUOTA SYSTEM - UNDERTAKING ' S PRODUCTION IN EXCESS OF ITS QUOTA - NECESSITY - PRINCIPLE NOT APPLICABLE ( ECSC TREATY , ART . 58 ) 3 . ECSC - PRODUCTION - STEEL PRODUCTION QUOTA SYSTEM - UNDERTAKING ' S PRODUCTION IN EXCESS OF ITS QUOTA - FINE - SERIOUS ECONOMIC DIFFICULTIES IF QUOTA COMPLIED WITH - REDUCTION OF FINE - NOT POSSIBLE ( ECSC TREATY , ART . 58 )