diff --git a/erpnext/accounts/doctype/pos_invoice/pos_invoice.py b/erpnext/accounts/doctype/pos_invoice/pos_invoice.py
index 9649f80..6e3a076 100644
--- a/erpnext/accounts/doctype/pos_invoice/pos_invoice.py
+++ b/erpnext/accounts/doctype/pos_invoice/pos_invoice.py
@@ -222,9 +222,6 @@
 		from erpnext.stock.stock_ledger import is_negative_stock_allowed
 
 		for d in self.get("items"):
-			is_service_item = not (frappe.db.get_value("Item", d.get("item_code"), "is_stock_item"))
-			if is_service_item:
-				return
 			if d.serial_no:
 				self.validate_pos_reserved_serial_nos(d)
 				self.validate_delivered_serial_nos(d)
diff --git a/erpnext/selling/page/point_of_sale/pos_payment.js b/erpnext/selling/page/point_of_sale/pos_payment.js
index b4ece46..0a356b9 100644
--- a/erpnext/selling/page/point_of_sale/pos_payment.js
+++ b/erpnext/selling/page/point_of_sale/pos_payment.js
@@ -161,13 +161,13 @@
 
 		frappe.ui.form.on('POS Invoice', 'contact_mobile', (frm) => {
 			const contact = frm.doc.contact_mobile;
-			const request_button = $(this.request_for_payment_field.$input[0]);
+			const request_button = $(this.request_for_payment_field?.$input[0]);
 			if (contact) {
 				request_button.removeClass('btn-default').addClass('btn-primary');
 			} else {
 				request_button.removeClass('btn-primary').addClass('btn-default');
-      }
-    });
+			}
+		});
 
 		frappe.ui.form.on('POS Invoice', 'coupon_code', (frm) => {
 			if (frm.doc.coupon_code && !frm.applying_pos_coupon_code) {