Stoplevel & Freezelevel always zero

Hi,

I tried this code with different underlyings

            Print("Freezelevel is ",MarketInfo(Symbol(),MODE_FREEZELEVEL));
            Print("Stoplevel is ",MarketInfo(Symbol(),MODE_STOPLEVEL)); 

And I get always

Freezelevel is 0

Stoplevel is 0

Can anybody explain my why??