To ensure supervisory outcomes which are consistent with the existing supervisory frameworks, the parent undertakinga parent undertaking within the meaning of Article 2, point (9), and Article 22 of Directive 2013/34/EU of financial entitiesas defined in Article 2, points (a) to (t) that are part of a groupa group as defined in Article 2, point (11), of Directive 2013/34/EU as defined in the applicable financial services regulations should define the scope of entities to be included in the register of information at sub-consolidated and consolidated level by applying these financial services regulations. To reduce their administrative costs, groupsa group as defined in Article 2, point (11), of Directive 2013/34/EU may develop a single register of information at entity, sub- consolidated and consolidated levels in relation to all contractual arrangements on the use of ICT servicesdigital and data services provided through ICT systems to one or more internal or external users on an ongoing basis, including hardware as a service and hardware services which includes the provision of technical support via software or firmware updates by the hardware provider, excluding traditional analogue telephone services provided by ICT third-party service providersan undertaking providing ICT services to all the financial entitiesas defined in Article 2, points (a) to (t), which are part of the groupa group as defined in Article 2, point (11), of Directive 2013/34/EU. In such cases, the single register of information should allow each financial entity to fulfil its obligation to maintain and update the register of information at entity and sub-consolidated level, when applicable, including its reporting to its competent authorityas defined in Article 46.