Fix "fields" attribute for PurchaseOrderLineItem edit form
Fix "fields" attribute for PurchaseOrderLineItem edit form

- The 'order' field was not being included

SchrodingersGat/InvenTree,inventree/InvenTree,SchrodingersGat/InvenTree,inventree/InvenTree,inventree/InvenTree,SchrodingersGat/InvenTree,SchrodingersGat/InvenTree,inventree/InvenTree