Seller doesn't have occupancy certificate what to do.

I am planning to buy my first house , its a resale one. I got all the documents from the seller , the property comes under BMICAPA and it is a PANCHAYAT khata. Seller doesn't has Occupancy certificate of the property . Does BMICAPA/Gram Panchayat gives Occupancy certificate ? I don't have deep understanding of these khata and all , the only thing i know is only Khata A is good. The property is dere in Doddathoguru , Ecity phase 1 . I got to know that BBMP is coming to doddathoguru . Now the question is whether I should buy this property or not ? Coz Seller does not has Occupancy certificate and the property is having PANCHAYAT khata. Will it create any issues in future if I go with this property ? Do i need to get the khata transferred to bbmp and if this khata is transferred will BBMP consider it as A KHATA ? And from where should I get Occupancy certificate which I think is very important as per my research on the internet. Religion - Hindu