[amibroker] Help with !NOT

["Esteban" <ygroups@xxxx>]

I keep getting an error when trying to 
use  !NOT
 
I have a variable called LowVol set by 
the statement:  LowVol= V < 200000;
Another variable called B1 
that defines buy conditions.
 
Now for the Buy statement that generates 
the error message:
Buy = B1 AND  !NOT 
LowVol;
 
What am I doing wrong?
 
Esteban