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 groupa 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 uniformity, correctness and consistency of all the data in the register of information. In particular, ensuring the unicity and consistency across the scope of consolidation of the different keys e.g. the contractual arrangement reference numbers, the function identifier and the unique identifiers of the financial entitiesas defined in Article 2, points (a) to (t) and ICT third-party service providersan undertaking providing ICT services (i.e. ‘LEI’) is crucial to ensure such operability.