ECSC - PRODUCTION - SYSTEM OF STEEL PRODUCTION AND DELIVERY QUOTAS - PRODUCTION IN EXCESS OF QUOTAS - FINE - DIFFERENT VIEW AS TO THE METHOD OF CALCULATING QUOTAS - WHETHER CIRCUMSTANCE AFFORDING A DEFENCE - NO - BREACH OF THE PRINCIPLE OF LEGALITY - NONE ( ECSC TREATY , ART . 58 ; GENERAL COMMISSION DECISION NO 1831/81/ECSC , ARTS 10 AND 12 )