'salesteammember' does not seem to be valid column on sales team sublist ???

Hi-

Here is my code... I have tried about a thousand different guesses for the columns. Anyway, the nlapiGetLineItemValue('salesteam','salesteammember',x) line will always return "null", no matter what...

Any ideas?

var salesteamlines = nlapiGetLineItemCount('salesteam');
var primerep=0;

for ( x = 1 ; x<= salesteamlines ; x++ )
{
var linerep = nlapiGetLineItemValue('salesteam','isprimary',x);

if(linerep=="T")
primerep=nlapiGetLineItemValue('salesteam','salesteammember',x);
};