Survey No Mentioning P

I am purchasing a land which is mentioned as agriculture land in RTC but in the maps it is coming in yellow belt. The survey no. indicated "P" which I am little doubtful whether to purchase or not. The land history is mentioned below in 1976 the person (A) sold 1 acre out of 70 acre to the party B B is having a wife C and 2 sons D and E in 2004 E sold making a witness affidivate stating that B is dead, C and D also dead. and he is the successor of the property and sold to F. F transferred RTC in his name for said 1 acre property and made 30 sites and sold to various parties. Please note he never converted the site for residential purpose. G brought the one site from F in 2005 and sold in 2011 to H after paying tax in panchayat office. H is got the electricity connection and paid the tax till date and ready to sell the property now. I also like to inform the land is recently added to Corporation limit but new survey not yet done till date. My question is 1. Mentioning "P" in subtitle of survey no is having any problem for registering/ selling in future. 2. The parties C and D is dead but it is not mentioned about their sons/daughters while making the witness deed. Even the sons/daughters of E also not signed the witness in the said deed. 3. Can I purchase this land or not please suggest