i am trying to add shipping method list in suitelet
var shipMthd_fld = form.addField({
id: 'custpage_so_ship_mthd',
source: 'shipitem',
type: serverWidget.FieldType.SELECT,
label: 'Shipping Method',
container: 'so_fieldgroupid'
});
i am not able to see the list,
• where can i find the exact source id