To enable the operability of the register of information at entity, sub-consolidated and consolidated level across all the financial entitiesas defined in Article 2, points (a) to (t) that are part of the same groupmeans a group as defined in Article 2, point (11), of Directive 2013/34/EU;, financial entitiesas defined in Article 2, points (a) to (t) should ensure the correctness and consistency of all the data in that register. In particular, to enable such operability, it is necessary to ensure consistency in the consolidation of the identifiers, namely the contractual arrangement reference numbers, the function identifier, LEI of the financial entitiesas defined in Article 2, points (a) to (t) and identifiers of the ICT third-party service providersmeans an undertaking providing ICT services;.