(19)For the purposes of strengthening the prudential supervision of reinsurance undertakings, it should be laid down that an auditor has a duty to report promptly to the competent authorities, wherever, as provided for by this Directive, he/she becomes aware, while carrying out his/her tasks, of certain facts which are liable to have a serious effect on the financial situation or the administrative and accounting organisation of a reinsurance undertaking. Having regard to the aim in view, it is desirable for Member States to provide that such a duty should apply in all circumstances where such facts are discovered by an auditor during the performance of his/her tasks in an undertaking which has close links with a reinsurance undertaking. The duty of auditors to communicate, where appropriate, to the competent authorities certain facts and decisions concerning a reinsurance undertaking which they discover during the performance of their tasks in a non-reinsurance undertaking does not in itself change the nature of their tasks in that undertaking nor the manner in which they must perform those tasks in that undertaking.