The Prefect shall request the repayment of all or part of the grant in the following cases:
a) If the allocation of the subsidised investment has been modified without his authorisation before the expiry of the period set in the order awarding the grant;
b) If he is aware that the ceiling provided for in the second paragraph of article D. 2564-14;
c) If the operation is not carried out within the period stipulated in article D. 2564-16.