(6)Article 7a(4), fourth subparagraph, of Regulation (EU) No 648/2012 requires that compliance with the requirements laid down in Article 7a(3), points (a), (b) and (c) of that Regulation is stress-tested at least once a year. For that purpose, counterparties should run technical and functional tests on their IT connectivity with the authorised CCP, or with their clearing members and clients providing client clearing services. To confirm their active account’s operational capacity and its ability to withstand large increases of volumes under short notice, counterparties should demonstrate to their competent national authority that they have run those technical and functional tests.