Money and movable goods assigned to an endowment are to be deposited immediately in a safe place approved by the ordinary so that the money or value of the movable goods is protected; as soon as possible, these are to be invested cautiously and usefully for the benefit of the foundation, with express and specific mention made of the obligation; this investment is to be made according to the prudent judgment of the ordinary, after he has heard those concerned and his own finance council.
Source: Code of Canon Law (Vatican.va)