Do you have this piece setup appropriately as an OnChange Client Script?

//Client Script

function onChange(control, oldValue, newValue, isLoading, isTemplate) {
if (isLoading || newValue === '') {
return;
}


if (!newValue){

g_form.clearValue('u_advisor_number');
g_form.clearValue('u_advisor_region');
g_form.clearValue('u_advisor_district');
g_form.clearValue('u_district_manager');

}