diff --git a/addons/mrp/res_config.py b/addons/mrp/res_config.py
index f0d28c9cae2..3f054224a45 100644
--- a/addons/mrp/res_config.py
+++ b/addons/mrp/res_config.py
@@ -82,10 +82,6 @@ class mrp_configuration(osv.osv_memory):
                            It assigns the "Properties of Product" group to employee."""),
     }
 
-    _defaults = {
-        'default_method': lambda s,c,u,ctx: s.pool.get('purchase.order').default_get(c,u,['invoice_method'],context=ctx)['invoice_method'],
-    }
-
 mrp_configuration()
 
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