78Moreover, as the Court of Justice has held as regards Directive 91/439, acknowledgment that a Member State is entitled to rely on its national provisions in order to refuse indefinitely to recognise a licence issued in another Member State would be fundamentally incompatible with the principle of mutual recognition of driving licences which is the linchpin of the system established by Directive 2006/126 (see, to that effect, Kapper, paragraph 77, and order in Halbritter, paragraph 28).