Fixed merge conflict

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);
+					}
 				}
 			}
 

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 () {

erpnext/public/js/utils/party.js

@@ -46,11 +46,26 @@ erpnext.utils.get_party_details = function(frm, method, args, callback) {
 				frm.updating_party_details = false;
 				if(callback) callback();
 				frm.refresh();
+				erpnext.utils.add_item(frm);
 			}
 		}
 	});
 }
 
+erpnext.utils.add_item = function(frm) {
+	if(frm.is_new()) {
+		var prev_route = frappe.get_prev_route();
+		if(prev_route[1]==='Item' && !(frm.doc.items && frm.doc.items.length)) {
+			// add row
+			item = frm.add_child('items');
+			frm.refresh_field('items');
+
+			// set item
+			frappe.model.set_value(item.doctype, item.name, 'item_code', prev_route[2]);
+		}
+	}
+}
+
 erpnext.utils.get_address_display = function(frm, address_field, display_field, is_your_company_address) {
 	if(frm.updating_party_details) return;