diff --git a/erpnext/patches/v12_0/gst_update_hsn_code_in_stock_entry.py b/erpnext/patches/v12_0/gst_update_hsn_code_in_stock_entry.py
new file mode 100644
index 0000000..2d16f6f
--- /dev/null
+++ b/erpnext/patches/v12_0/gst_update_hsn_code_in_stock_entry.py
@@ -0,0 +1,27 @@
+# Copyright (c) 2015, Frappe Technologies Pvt. Ltd. and Contributors
+# License: GNU General Public License v3. See license.txt
+
+
+from __future__ import unicode_literals
+import frappe
+from frappe.custom.doctype.custom_field.custom_field import create_custom_fields
+
+def execute():
+    company = frappe.get_cached_value("Company", {'country': 'India'}, 'name')
+    if not company:
+        return
+
+    custom_fields = {
+        'Stock Entry Detail': [dict(fieldname='gst_hsn_code', label='HSN/SAC',
+            fieldtype='Data', fetch_from='item_code.gst_hsn_code',
+            insert_after='description', allow_on_submit=1, print_hide=0)]
+    }
+
+    create_custom_fields(custom_fields, ignore_validate = frappe.flags.in_patch, update=True)
+
+    frappe.db.sql(""" update `tabStock Entry Detail`, `tabItem`
+        SET
+            `tabStock Entry Detail`.gst_hsn_code = `tabItem`.gst_hsn_code
+        Where
+            `tabItem`.name = `tabStock Entry Detail`.item_code and `tabItem`.gst_hsn_code is not null
+    """)
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