1. The requested authority in one Member State shall provide a requesting authority in another Member State with the information referred to in Article 1 provided that:

(a) the number and the nature of the requests for information made by the requesting authority within a specific period do not impose a disproportionate administrative burden on that requested authority;

(b) that requesting authority has exhausted the usual sources of information which it could have used in the circumstances to obtain the information requested, without running the risk of jeopardising the achievement of the desired end.

2. This Regulation shall impose no obligation to have enquiries carried out or to provide information on a particular case if the laws or administrative practices of the Member State which would have to supply the information do not authorise the Member State to carry out those enquiries or collect or use that information for that Member State’s own purposes.

3. The competent authority of a requested Member State may refuse to provide information where the requesting Member State is unable, for legal reasons, to provide similar information. The Commission shall be informed of the grounds of the refusal by the requested Member State.