1.   The receiving body shall send an acknowledgement of receipt to the submitting body as soon as possible and in any case within 5 working days of receipt of a notification or request made pursuant to Article 4, using the form set out in Annex II, and, where possible, indicate an estimated date of response.

2.   Whenever it is not possible to indicate an estimated date of response, the receiving body shall indicate the frequency with which it will update the submitting body.