On a proper construction of Article 5(1) of the Convention of 27 September 1968 on Jurisdiction and the Enforcement of Judgments in Civil and Commercial Matters, as amended by the Convention of 9 October 1978 on the Accession of the Kingdom of Denmark, Ireland and the United Kingdom of Great Britain and Northern Ireland, the same court does not have jurisdiction to hear the whole of an action founded on two obligations of equal rank arising from the same contract when, according to the conflict rules of the State where that court is situated, one of those obligations is to be performed in that State and the other in another Contracting State.