3. If any of the competent authorities of the Member States concerned consider that the application is not duly completed, they shall request the missing information from the competent authorities of the Member State of origin and inform the other competent authorities of such request. This request shall be made not later than the expiry of the period set out in paragraph 1.
The competent authorities of the Member State of origin shall transmit the requested information to the competent authorities concerned.
Not later than 10 days after the date of receipt of the missing information and not earlier than after expiry of the 20 days period set out in paragraph 1, the competent authorities of the Member State of destination shall send an acknowledgement of receipt to the competent authorities of the Member State of origin and copy it to the other competent authorities concerned.