economic agents established in the European Community who, at the time of registration: (a) have been engaged independently and on their own account in the commercial activity of importing fresh fruit and vegetables falling within Chapters 7 and 8, of the Tariff and Statistical Nomenclature and the Common Customs Tariff, or products under Chapter 9 thereof if they have also imported products falling within Chapters 7 and 8 in one of the three years immediately preceding the year in respect of which registration is sought; and (b) by virtue of this activity, have undertaken imports to a declared customs value of ECU 400 000 or more during the period referred to in point (a).