Whereas the solvency of a related subsidiary insurance undertaking of an insurance holding company, reinsurance undertaking or non-member-country insurance undertaking may be affected by the financial resources of the group of which it is a part and by the distribution of financial resources within that group; whereas the competent authorities should be provided with the means of exercising supplementary supervision and of taking appropriate measures at the level of the insurance undertaking where its solvency is or may be jeopardised;