X person purchased a immovable property in Bangalore Village Panchayat via GPA during 2007. The prop

X person purchased a immovable property in Bangalore Village Panchayat via GPA during 2007. The property was allotted by Govt of Karnataka in 1972 to the owner. As per law the owner didn't have rights to sell for 25 years of term from the day of allotment from Govt. Hence a GPA was executed via Notary where the person have paid final amount in the year of 2007 (after 20 years). GPA was signed by Owner/ his wife/ Son in front of NotaryFinally a Notarized promissory note was signed by owner's son & wife declaring they have received money & Property was sold to X person after the term of 25yearsThis person having full documents including the Hakku patra issued by Govt of Karnataka, then paying tax from 2007 onwards regularly. In 2007 property came under BBMP from Panchayat. nnGPA Registration made mandatory from 2011 or 2012 there is any problem buying this property nnCan I Buy this property or not kindly advise me.