If the law applied by the competent authority obliges the parties to secure evidence and the authority is not able itself to execute the letters rogatory, that authority may, with the consent of the competent department, appoint a suitable person to do so. When seeking the consent of the department concerned, the competent authority must indicate the approximate costs which would result from this procedure. If the competent department gives its consent, the European Patent Organisation must reimburse any costs incurred; without such consent, the Organisation is not liable for such costs.[Rule 150(8); ]