Any natural or legal person established within the Community who regularly supplies a customer with a scheduled substance in category 2 of Annex I to Directive 92/109/EEC and who is obliged to document transactions pursuant to Article 2 of the said Directive may accept, as an alternative to the declaration for individual transactions, a single declaration in respect of a number of transactions over a period of one year maximum provided that the supplier is satisfied the following criteria have been met: - the customer is one to whom he has supplied the substance on at least three occasions in the preceding 12 months, - the supplier has no reason to suppose that the substance will be used for illicit purposes, - the quantities ordered are consistent with usual consumption for that customer.