[minor] default qty 0, fixes frappe/erpnext#9880
diff --git a/erpnext/public/js/utils/serial_no_batch_selector.js b/erpnext/public/js/utils/serial_no_batch_selector.js
index 735f5c4..08630e5 100644
--- a/erpnext/public/js/utils/serial_no_batch_selector.js
+++ b/erpnext/public/js/utils/serial_no_batch_selector.js
@@ -66,7 +66,7 @@
 				fieldtype:'Float',
 				read_only: 1,
 				label: __(me.has_batch ? 'Total Qty' : 'Qty'),
-				default: me.qty
+				default: 0
 			},
 		];