The donation shall be revoked at the instance of the donor, when the donee fails to comply with any of the conditions which the former imposed upon the latter.
In this case, the property donated shall be returned to the donor, the alienations made by the donee and the mortgages imposed thereon by him being void, with the limitations established, with regard to third persons, by the Mortgage Law and the Land Registration laws.
This action shall prescribe after four years from the noncompliance with the condition, may be transmitted to the heirs of the donor, and may be exercised against the donee's heirs. (647a)