(7)As auditors and audit firms of companies of the Union which have issued securities in the United States of America, or which form part of a group issuing statutory consolidated accounts in that country are regulated by the laws of the United States of America, it should be decided whether the competent authorities of Member States may transfer audit working papers or other documents held by statutory auditors or audit firms to the competent authorities of the United States of America solely for the purposes of the exercise of their competences of public oversight, external quality assurance and investigations of auditors and audit firms.