[amibroker] What wrong am I doing here

[Prashanth]

Hello,

This should be outright silly, but I have had enough of head stratching and 
wanted to know what is wrong.

I am trying to explore (Get Value) of the Open Interest (which is available) 
for a particular ticker using

Filter=1;
AddColumn(Foreign("Nifty-I","OI"),"");


Instead, I am given the Close Value of Nifty-I. I can access Volume if I use V 
instead of OI, but not OI. 

Any views?

Regards

Prashanth