(12)This Directive should however not apply to insurance undertakings which are already subject to Directives 73/239/EEC or 2002/83/EC; however, in order to ensure the financial soundness of insurance undertakings which also carry on reinsurance business and that the specific characteristics of those activities is duly taken into account by the capital requirements of those insurance undertakings, the provisions relating to the solvency margin of reinsurance undertakings contained in this Directive should apply to reinsurance business of those insurance undertakings, if the volume of their reinsurance activities represents a significant part of their entire business.