(25)In order to ensure that the information reported by participating insurance and reinsurance undertakings or insurance holding companies at the level of the group is accurate and complete, national supervisory authorities should not allow limitations on the information to be reported or exempt from reporting on an item-by-item basis undertakings which belong to a group, unless the national supervisory authority is satisfied that reporting would be inappropriate given the nature, scale and complexity of the risks inherent in the business of the group.