29As for the concept of ‘counter-claim’, which is not defined in Article 20(2) of Regulation No 44/2001, it is necessary, in the light of what is recalled in paragraph 26 of this judgment, to take account of the concept of ‘counter-claim’ in Article 6, point 3, of Regulation No 44/2001, as interpreted by the Court. It is clear from the case-law of the Court that, in the interests of the sound administration of justice, the special jurisdiction for counter-claims enables the parties, in the same proceedings and before the same court, to litigate all their claims against each other that have a common origin. Thus, unnecessary multiple proceedings are avoided (judgment of 12 October 2016, Kostanjevec, C‑185/15, EU:C:2016:763, paragraph 37).
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