when I'm looking at a sales order, in netsuite field explorer I can see an item field by the name of

linkedshiprcpt

that shows whether a sales order item has been fulfilled or not - but I cannot seem to find this field anywhere in search, and using a text formula like

{item.linkedshiprcpt}

doesn't seem to work either (Field not found) - are there other ways I could get this field value for an item in a sales order? (via search)