diff --git a/erpnext/maintenance/doctype/maintenance_visit/maintenance_visit.js b/erpnext/maintenance/doctype/maintenance_visit/maintenance_visit.js
index 2e2a9ce0401..fff46ad67e3 100644
--- a/erpnext/maintenance/doctype/maintenance_visit/maintenance_visit.js
+++ b/erpnext/maintenance/doctype/maintenance_visit/maintenance_visit.js
@@ -49,13 +49,17 @@ erpnext.maintenance.MaintenanceVisit = frappe.ui.form.Controller.extend({
 
 		if (this.frm.doc.docstatus===0) {
 			this.frm.add_custom_button(__('Maintenance Schedule'),
-				function() {
+				function () {
+					if (!me.frm.doc.customer) {
+						frappe.msgprint(__('Please select Customer first'));
+						return;
+					}
 					erpnext.utils.map_current_doc({
 						method: "erpnext.maintenance.doctype.maintenance_schedule.maintenance_schedule.make_maintenance_visit",
 						source_doctype: "Maintenance Schedule",
 						target: me.frm,
 						setters: {
-							customer: me.frm.doc.customer || undefined,
+							customer: me.frm.doc.customer,
 						},
 						get_query_filters: {
 							docstatus: 1,
@@ -80,13 +84,17 @@ erpnext.maintenance.MaintenanceVisit = frappe.ui.form.Controller.extend({
 					})
 				}, __("Get items from"));
 			this.frm.add_custom_button(__('Sales Order'),
-				function() {
+				function () {
+					if (!me.frm.doc.customer) {
+						frappe.msgprint(__('Please select Customer first'));
+						return;
+					}
 					erpnext.utils.map_current_doc({
 						method: "erpnext.selling.doctype.sales_order.sales_order.make_maintenance_visit",
 						source_doctype: "Sales Order",
 						target: me.frm,
 						setters: {
-							customer: me.frm.doc.customer || undefined,
+							customer: me.frm.doc.customer,
 						},
 						get_query_filters: {
 							docstatus: 1,
@@ -99,4 +107,4 @@ erpnext.maintenance.MaintenanceVisit = frappe.ui.form.Controller.extend({
 	},
 });
 
-$.extend(cur_frm.cscript, new erpnext.maintenance.MaintenanceVisit({frm: cur_frm}));
\ No newline at end of file
+$.extend(cur_frm.cscript, new erpnext.maintenance.MaintenanceVisit({frm: cur_frm}));
diff --git a/erpnext/selling/doctype/sales_order/sales_order.py b/erpnext/selling/doctype/sales_order/sales_order.py
index 59df180ff8c..086737ca04a 100755
--- a/erpnext/selling/doctype/sales_order/sales_order.py
+++ b/erpnext/selling/doctype/sales_order/sales_order.py
@@ -714,8 +714,7 @@ def make_maintenance_schedule(source_name, target_doc=None):
 				"doctype": "Maintenance Schedule Item",
 				"field_map": {
 					"parent": "sales_order"
-				},
-				"add_if_empty": True
+				}
 			}
 		}, target_doc)
 
@@ -741,8 +740,7 @@ def make_maintenance_visit(source_name, target_doc=None):
 				"field_map": {
 					"parent": "prevdoc_docname",
 					"parenttype": "prevdoc_doctype"
-				},
-				"add_if_empty": True
+				}
 			}
 		}, target_doc)