diff --git a/erpnext/public/js/controllers/transaction.js b/erpnext/public/js/controllers/transaction.js
index 799730edd5..4e08287004 100644
--- a/erpnext/public/js/controllers/transaction.js
+++ b/erpnext/public/js/controllers/transaction.js
@@ -781,7 +781,9 @@ erpnext.TransactionController = erpnext.taxes_and_totals.extend({
 					if(k=="price_list_rate") {
 						if(flt(v) != flt(d.price_list_rate)) price_list_rate_changed = true;
 					}
-					frappe.model.set_value(d.doctype, d.name, k, v);
+					if(v) {
+						frappe.model.set_value(d.doctype, d.name, k, v);
+					}
 				}
 			}
 
diff --git a/erpnext/public/js/utils.js b/erpnext/public/js/utils.js
index 74e9fb655c..bf6941b347 100644
--- a/erpnext/public/js/utils.js
+++ b/erpnext/public/js/utils.js
@@ -47,6 +47,7 @@ $.extend(erpnext, {
 				fields: [
 					{
 						"fieldtype": "Link",
+						"fieldname": "serial_no",
 						"options": "Serial No",
 						"label": __("Serial No"),
 						"get_query": function () {
@@ -60,6 +61,7 @@ $.extend(erpnext, {
 					},
 					{
 						"fieldtype": "Button",
+						"fieldname": "add",
 						"label": __("Add")
 					}
 				]