“It is for the member states to lay down the conditions for the application of the exemption of intra-Community supplies of goods. It is important to note, however, that when they exercise their powers, member states must comply with the general principles of law which form part of the Community legal order, which include, in particular, the principles of egal certainty and proportionality.”
“Accordingly, it would be contrary to the principle of legal certainty if a member state which has laid down the conditions for the application of the exemption of intra-Community supplies by prescribing, among other things,a list of the documents to be presented to the competent authorities, and which has accepted, initially, the documents presented by the supplier as evidence establishing entitlement to the exemption, could subsequently require that supplier to account for the VAT on that supply, where it transpires that, because of the purchaser’s fraud, of which the supplier had and could have had no knowledge, the goods concerned did not actually leave the territory of the member state of supply.”