Effectivity of Contract

Again, a voluntary easement of right of way is like any other contract. As such, it is generally effective between the parties, their heirs and assigns, except in case where the rights and obligations arising from the contract are not transmissible by their nature, or by stipulation or by provision of law. (Unisource v. Chung, G.R. No. 173252, July 17, 2009)