COMMON CUSTOMS TARIFF - SYSTEM OF GENERALIZED PREFERENCES IN FAVOUR OF DEVELOPING COUNTRIES - CERTIFICATE OF ORIGIN OF GOODS - PRODUCTION AFTER EXPIRY OF THE PERIOD OF PREFERENTIAL TREATMENT - ADMISSIBILITY - CONDITIONS - FAILURE TO OBSERVE ADDITIONAL CONDITIONS IMPOSED BY NATIONAL LAW - NO INFLUENCE ( REGULATION ( EEC ) NO 3004/75 OF THE COUNCIL ; REGULATION ( EEC ) NO 3214/75 OF THE COMMISSION , ARTS 7 AND 11 )