diff --git a/addons/stock/models/stock_picking.py b/addons/stock/models/stock_picking.py
index 83a83c3e10b..dbf11a61dd9 100644
--- a/addons/stock/models/stock_picking.py
+++ b/addons/stock/models/stock_picking.py
@@ -245,8 +245,10 @@ class Picking(models.Model):
     picking_type_code = fields.Selection([
         ('incoming', 'Vendors'),
         ('outgoing', 'Customers'),
-        ('internal', 'Internal')], related='picking_type_id.code')
-    picking_type_entire_packs = fields.Boolean(related='picking_type_id.show_entire_packs')
+        ('internal', 'Internal')], related='picking_type_id.code',
+        readonly=True)
+    picking_type_entire_packs = fields.Boolean(related='picking_type_id.show_entire_packs',
+        readonly=True)
 
     quant_reserved_exist = fields.Boolean(
         'Has quants already reserved', compute='_compute_quant_reserved_exist',