fix: selected batch no changed on updation of qty

erpnext/selling/sales_common.js

@@ -394,6 +394,10 @@ erpnext.selling.SellingController = class SellingController extends erpnext.Tran
 	}
 
 	_set_batch_number(doc) {
+		if (doc.batch_no) {
+			return
+		}
+
 		let args = {'item_code': doc.item_code, 'warehouse': doc.warehouse, 'qty': flt(doc.qty) * flt(doc.conversion_factor)};
 		if (doc.has_serial_no && doc.serial_no) {
 			args['serial_no'] = doc.serial_no

erpnext/stock/get_item_details.py

@@ -278,6 +278,10 @@ def get_basic_details(args, item, overwrite_warehouse=True):
 		else:
 			args.uom = item.stock_uom
 
+	if (args.get("batch_no") and
+		item.name != frappe.get_cached_value('Batch', args.get("batch_no"), 'item')):
+		args['batch_no'] = ''
+
 	out = frappe._dict({
 		"item_code": item.name,
 		"item_name": item.item_name,