1. At the request of the requesting authority, the requested authority shall communicate the information referred to in Article 1, including any information relating to a specific case or cases.

2. For the purpose of forwarding the information referred to in paragraph 1, the requested authority shall arrange for the conduct of any administrative enquiries necessary to obtain such information.

3. [deleted]

4. The request referred to in paragraph 1 may contain a reasoned request for a specific administrative enquiry. The requested authority shall undertake the administrative enquiry in consultation of the requesting authority where necessary. If the requested authority takes the view that no administrative enquiry is necessary, it shall immediately inform the requesting authority of the reasons thereof.

Notwithstanding the first subparagraph, an enquiry into the amounts declared or those that should have been declared by a taxable person established in the Member State of the requested authority, in connection with supplies of goods or services which are made by this taxable person and which are taxable in the Member State of the requesting authority, may be refused solely on any of the following grounds: