As far as the purpose of bringing about the cessation of practices that are
unlawful under the national provisions applicable is concerned, the effect
iveness of national measures transposing the Directives in question, including protective measures that go beyond the leve
l required by those Directives, provided they are compatible with the Treaty and allowed by those Directives, may be thwarted where those practices produce effects
...[+++] in a Member State other than that in which they originate.