Hide a field in Grid

Dear All,

How to hide the field Amount from below grid. I have tried using below code but it didn't work for Amount field,

NoSalsPric = UserInfoHelp::userInUserGroup(curUserId(), "NoSalsPric");
if (NoSalsPric == true)
{
custConfirmTrans_ds.object(fieldNum(CustConfirmTrans, SalesPrice)).visible(false);
custConfirmTrans_ds.object(fieldNum(CustConfirmTrans, LineAmount)).visible(false);
}

Please help me.

Many Thanks,

Selva