Flat in B Khata and Property Tax

Hi, I bought a flat which is B Khata (Land A Khata but apartment has some horizontal and vertical deviations). Now I am paying Property Tax every year online using SAS based Application number and in that receipt the Owner name of the flat is my name. Now do I need to seperately get B Khata form for it or property tax itself is enough. As I understand that there is nothing called B Khata, it is just BBMP is maintaining a separate ledger for these kind of properties. And B Khata is illegal constructions against BBMP approvals. Please help me if I have to separately get B Khata or my property paid tax slips are enough during A Khata conversion if at all it happens in future.