Article 4 Formalities and procedures in the execution of requests for mutual assistance

Where mutual assistance is afforded, the requested Member State shall comply with the formalities and procedures expressly indicated by the requesting Member State, unless otherwise provided in this Convention and provided that such formalities and procedures are not contrary to the fundamental principles of law in the requested Member State.

The requested Member State shall execute the request for assistance as soon as possible, taking as full account as possible of the procedural deadlines and other deadlines indicated by the requesting Member State. The requesting Member State shall explain the reasons for the deadline.

If the request cannot, or cannot fully, be executed in accordance with the requirements set by the requesting Member State, the authorities of the requested Member State shall promptly inform the authorities of the requesting Member State and indicate the conditions under which it might be possible to execute the request. The authorities of the requesting and the requested Member State may subsequently agree on further action to be taken concerning the request, where necessary by making such action subject to the fulfilment of those conditions.

If it is foreseeable that the deadline set by the requesting Member State for executing its request cannot be met, and if the reasons referred to in paragraph 2, second sentence, indicate explicitly that any delay will lead to substantial impairment of the proceedings being conducted in the requesting Member State, the authorities of the requested Member State shall promptly indicate the estimated time needed for execution of the request. The authorities of the requesting Member State shall promptly indicate whether the request is to be upheld nonetheless. The authorities of the requesting and requested Member States may subsequently agree on further action to be taken concerning the request.