ECSC - PRODUCTION - SYSTEM OF STEEL PRODUCTION AND DELIVERY QUOTAS - EXCEEDING THE DELIVERY QUOTA IN A PARTICULAR QUARTER - REDUCTION OF DELIVERIES IN A SUBSEQUENT QUARTER IN ORDER TO COMPENSATE FOR THE EXCESS - NOT PERMISSIBLE - EXCEPTIONAL DIFFICULTIES OF THE UNDERTAKING IN OBSERVING THE QUOTA - BELATED REACTION BY THE COMMISSION - REDUCTION IN FINE ( ECSC TREATY , ART . 58 ; GENERAL DECISION NO 1831/81 , ART . 8 , AS AMENDED BY DECISION NO 2804/81 , AND ART . 12 )