If a request cannot be executed because it does not contain all of the necessary information pursuant to Article 4, the requested court shall inform the requesting court thereof without delay and, at the latest, within 30 days of receipt of the request using form C in the Annex, and shall request it to send the missing information, which should be indicated as precisely as possible.

If a request cannot be executed because a deposit or advance is necessary in accordance with Article 18(3), the requested court shall inform the requesting court thereof without delay and, at the latest, within 30 days of receipt of the request using form C in the Annex and inform the requesting court how the deposit or advance should be made. The requested Court shall acknowledge receipt of the deposit or advance without delay, at the latest within 10 days of receipt of the deposit or the advance using form D.