Property Purchase

Hi Sir, I need your suggestion on one of the property that i am planning to purchase.The property (2bhk flat) is located near Domsandra circle (from here to 4kms inside), Bangalore, its under grampanchayat limit,layout approved by BMRDA and looks good to me.I am verified the legal documents as well via a lawyer, all looks good. Also i did a ground work for verifying the documents via differnt Karnataka govt websites such as eSwathu, bhoomi, karnatakalandlord,RERA etc.But i have a doubt on the khata document. The builder provided me the E-Khata as a legal document verification process. When i see the khata it was mentioned like its 11B properties. Also to double check the same khata i was downloaded from eSwathu website by providing the PID no, both are same in this point.  While researching on the 11B properties i have received a lot of information from differnet sites and people and came to a confusion state. somewhere it was mentioned like the grampanchayat will issue Ekhata with form 11B for illlegal properties to collect the tax and it comes under B khata. Somewhere it was mentioned like there is no concept of B khata etc.. When i asked to the builder regardinng this E khata with 11B peroerties they replied me like below Panchayath will issue E-Katha in form 11B to the converted vacant land before getting the single plot approval but it will not issue the form 9 and E-Katha in form 11A along with form 9 will issue to the individual flats after construction of flats. My understanding on the above statement is like during registration of the flats the grampanchayat will issue the Ekhata + Form 9 + Form 11A via builder.could you please clarify? Also is this the right process / rule followed by the grampanchyat officials? Apart from this i have verified all the legal documents (DC+all the EC + BMRDA plan+ site plan+ NOC+ sale deed+ family tree+MR+CC+RTC+Survey Doc+PTCL+Tippani + Tax paid receipts + KSPCB NOC+ Akarabhand + Public notice message nes snapshot for the expired people in the family tree + etc..)