To ensure supervisory outcomes which are consistent with the existing supervisory frameworks, the parent undertakingmeans a 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 groupmeans a group as defined in Article 2, point (11), of Directive 2013/34/EU; as defined in Regulation (EU) 2022/2554 should determine the entities to be included in the register of information at sub-consolidated and consolidated level in accordance with Union financial services legislation. To reduce administrative costs of groupsmeans a group as defined in Article 2, point (11), of Directive 2013/34/EU;, groupsmeans a group as defined in Article 2, point (11), of Directive 2013/34/EU; should have the possibility to develop a single register of information at entity, sub-consolidated and consolidated levels in relation to all contractual arrangements on the use of ICT servicesmeans digital 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 providersmeans an undertaking providing ICT services; to all the financial entitiesas defined in Article 2, points (a) to (t) that are part of that groupmeans a 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 comply with its obligation to maintain and update the register of information at entity and sub-consolidated level, where applicable, including its reporting to its competent authorityas defined in Article 46.