Sir/Madam, one of my friend purchased a land of twenty acres without knowing land history, it was double registration, owner had sold this land as housing plots, my friend has possession but no perfect title. There were lot of plot owners in that survey number. So, my friend is trying file caveat in local court but don't know plot owners names of opponents and address. Can file caveat mentioning only survey number? who come for injunction on that survey number it can prevent? court registry allow this petition? my lawyer say without opponents names can't file caveat, is it correct??