How future price works

Future price will show the weighted average of open long derivatives . 

For eg: 

Create few long derivative 

 if we need to  check average cost for the month of Sep-18 then Open Roll Cost screen and check the average of future long for the month of Sep - 18

In the above case  ((155*10)+(20*153))/30  and the Average Long price Should be 153.66

Weighted average will not consider the matched long. If there is balance qty for the buy after matching then the average will consider the balance qty for the weighted average.

 We can see the historical average price for a given month 

How Long historical price works.