Deed of Revocation of Deed of Donation

Thus and considering that the Deed of Donation was not registered nor annotated on the titles of Isaias Udal, registration of the Deed of Revocation of Donation executed by the latter and his heirs cannot be given due course for the simple reason that th edonation was not registered and therefore there is nothing to be revoked. To do otherwise, would create a vacuum or missing link in the chain of transactions involving the property in question. Moreover, the donor cannot unilaterally revoke the donation after it was perfected. (Parks vs. Province of Tarlac, 49 Phil. 142)