diff --git a/addons/mrp/models/mrp_production.py b/addons/mrp/models/mrp_production.py
index cfc80e4415d..342894ccd3a 100644
--- a/addons/mrp/models/mrp_production.py
+++ b/addons/mrp/models/mrp_production.py
@@ -53,7 +53,7 @@ class MrpProduction(models.Model):
         domain=[('type', 'in', ['product', 'consu'])],
         readonly=True, required=True,
         states={'confirmed': [('readonly', False)]})
-    product_tmpl_id = fields.Many2one('product.template', 'Product Template', related='product_id.product_tmpl_id')
+    product_tmpl_id = fields.Many2one('product.template', 'Product Template', related='product_id.product_tmpl_id', readonly=True)
     product_qty = fields.Float(
         'Quantity To Produce',
         default=1.0, digits=dp.get_precision('Product Unit of Measure'),