Article 7 of the EEC Treaty, read in conjunction with Article 220 of the Treaty and the Brussels Convention of 27 September 1968 on Jurisdiction and the Enforcement of Judgments in Civil and Commercial Matters, precludes a national provision of civil procedure which, in the case of a judgment to be enforced within national territory, authorizes seizure only on the ground that it is probable that enforcement will otherwise be made impossible or substantially more difficult, but, in the case of a judgment to be enforced in another Member State, authorizes seizure simply on the ground that enforcement is to take place abroad.