ECSC - PRODUCTION - SYSTEM OF STEEL PRODUCTION AND DELIVERY QUOTAS - DELIVERIES IN EXCESS OF QUOTAS - LACK OF WARNING FROM THE COMMISSION - BREACH OF THE PRINCIPLE OF THE PROTECTION OF LEGITIMATE EXPECTATION - NONE - FINE - DIFFICULTIES RESULTING FROM THE QUOTA ALLOCATED TO THE UNDERTAKING - RELEVANCE - REDUCTION OF THE FINE ( ECSC TREATY , ART . 58 ; DECISION 1831/81 , ART . 12 )