diff --git a/erpnext/stock/doctype/serial_and_batch_bundle/serial_and_batch_bundle.js b/erpnext/stock/doctype/serial_and_batch_bundle/serial_and_batch_bundle.js
index 614b466..f28eed3 100644
--- a/erpnext/stock/doctype/serial_and_batch_bundle/serial_and_batch_bundle.js
+++ b/erpnext/stock/doctype/serial_and_batch_bundle/serial_and_batch_bundle.js
@@ -127,6 +127,14 @@
 	},
 
 	toggle_fields(frm) {
+		if (frm.doc.has_serial_no) {
+			frm.doc.entries.forEach(row => {
+				if (Math.abs(row.qty) !== 1) {
+					frappe.model.set_value(row.doctype, row.name, "qty", 1);
+				}
+			})
+		}
+
 		frm.fields_dict.entries.grid.update_docfield_property(
 			'serial_no', 'read_only', !frm.doc.has_serial_no
 		);