diff --git a/addons/purchase/stock.py b/addons/purchase/stock.py
index 60b439a2097..e4a3252eef2 100644
--- a/addons/purchase/stock.py
+++ b/addons/purchase/stock.py
@@ -141,6 +141,6 @@ class stock_picking_in(osv.osv):
     _columns = {
         'purchase_id': fields.many2one('purchase.order', 'Purchase Order',
             ondelete='set null', select=True),
-        'warehouse_id': fields.related('purchase_id', 'warehouse_id', type='many2one', relation='stock.warehouse', string='Destination Warehouse'),
+        'warehouse_id': fields.related('purchase_id', 'warehouse_id', type='many2one', relation='stock.warehouse', string='Destination Warehouse', readonly=True),
     }
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