diff --git a/models/shipcloud_shipping_service.py b/models/shipcloud_shipping_service.py
index e80d856..f93afe0 100644
--- a/models/shipcloud_shipping_service.py
+++ b/models/shipcloud_shipping_service.py
@@ -10,8 +10,8 @@ class SMCShippingShipcloud(models.Model):
 # extend stock.picking with fields related to shipcloud
 class SMCStockPickingShipclodu(models.Model):
     _inherit = 'stock.picking'
-    sc_shipment_id = fields.Char(string='shipcloud shipment ID')
-    sc_tracking_url = fields.Char(string='shipcloud tracking URL')
+    sc_shipment_id = fields.Char(string='shipcloud shipment ID', readonly=True)
+    sc_tracking_url = fields.Char(string='shipcloud tracking URL', readonly=True)
     sc_content_desc = fields.Char(string='Description of Contents')