diff --git a/erpnext/education/doctype/student/student.js b/erpnext/education/doctype/student/student.js
index 2c933e28b7..b6e741c4da 100644
--- a/erpnext/education/doctype/student/student.js
+++ b/erpnext/education/doctype/student/student.js
@@ -27,3 +27,16 @@ frappe.ui.form.on('Student', {
 		}
 	}
 });
+
+frappe.ui.form.on('Student Guardian', {
+	guardians_add: function(frm){
+		frm.fields_dict['guardians'].grid.get_field('guardian').get_query = function(doc){
+			var guardian_list = [];
+			if(!doc.__islocal) guardian_list.push(doc.guardian);
+			$.each(doc.guardians, function(idx, val){
+				if (val.guardian) guardian_list.push(val.guardian);
+			});
+			return { filters: [['Guardian', 'name', 'not in', guardian_list]] };
+		};
+	}
+});
diff --git a/erpnext/selling/doctype/sales_order/sales_order.js b/erpnext/selling/doctype/sales_order/sales_order.js
index a2b85446be..85e81436d1 100644
--- a/erpnext/selling/doctype/sales_order/sales_order.js
+++ b/erpnext/selling/doctype/sales_order/sales_order.js
@@ -150,7 +150,7 @@ erpnext.selling.SalesOrderController = erpnext.selling.SellingController.extend(
 
 					// delivery note
 					if(flt(doc.per_delivered, 6) < 100 && ["Sales", "Shopping Cart"].indexOf(doc.order_type)!==-1 && allow_delivery) {
-						this.frm.add_custom_button(__('Delivery'), () => this.make_delivery_note_based_on_delivery_date(), __('Create'));
+						this.frm.add_custom_button(__('Delivery Note'), () => this.make_delivery_note_based_on_delivery_date(), __('Create'));
 						this.frm.add_custom_button(__('Work Order'), () => this.make_work_order(), __('Create'));
 					}