Hi Siva ,
Thanks for Response.
I was under impression buying/selling both contribute to OI at member level and they are to be added .
NSE rule states : “15% of the total open interest in the market in equity index option contracts”
Yes NSE never stated how OI is calculated , i.e Buying and selling both are considered separately and not combined (I hope Zerodha is right on this).
Kindly add the above explanation to zerodha support portal.