diff --git a/addons/stock/i18n/stock.pot b/addons/stock/i18n/stock.pot
index e0391f9f6a4..e223e20044d 100644
--- a/addons/stock/i18n/stock.pot
+++ b/addons/stock/i18n/stock.pot
@@ -3666,6 +3666,12 @@ msgstr ""
 msgid "Original Move"
 msgstr ""
 
+#. module: stock
+#: code:addons/stock/stock.py:576
+#, python-format
+msgid "Otherwise make sure the right stock/owner is set."
+msgstr ""
+
 #. module: stock
 #: model:ir.model.fields,field_description:stock.field_stock_warehouse_out_type_id
 msgid "Out Type"
diff --git a/addons/stock/stock.py b/addons/stock/stock.py
index 2c483c909ce..09ae09f9ebb 100644
--- a/addons/stock/stock.py
+++ b/addons/stock/stock.py
@@ -573,7 +573,7 @@ class stock_quant(osv.osv):
                                                  ('qty', '>', 0.0), ('location_id.usage', '=', 'internal')], context=context)
             if other_quants:
                 lot_name = self.pool['stock.production.lot'].browse(cr, uid, lot_id, context=context).name
-                raise UserError(_('The serial number %s is already in stock') % lot_name)
+                raise UserError(_('The serial number %s is already in stock.') % lot_name + _("Otherwise make sure the right stock/owner is set."))
 
         #create the quant as superuser, because we want to restrict the creation of quant manually: we should always use this method to create quants
         quant_id = self.create(cr, SUPERUSER_ID, vals, context=context)