diff --git a/openerp/openupgrade/doc/source/xmlids.rst b/openerp/openupgrade/doc/source/xmlids.rst
index 13a0f06cb3ff..cf3a80ab4cec 100644
--- a/openerp/openupgrade/doc/source/xmlids.rst
+++ b/openerp/openupgrade/doc/source/xmlids.rst
@@ -54,7 +54,10 @@ More interesting are
     * Any general data added by the module. Typically, data is loaded one time
       only using the 'noupdate' flag in the XML. You cannot simply force-load
       such data in your upgrade script, or you will for instance reset the
-      sequences used for invoice numbering. Revise any data carefully and
+      sequences used for invoice numbering. 
+      You can use this script 
+      'OpenUpgrade/scripts/compare_noupdate_xml_records.py' 
+      Revise any data carefully and
       copy relevant, new data in a separate file. Load it from your post script
       using :meth:`~openupgrade.load_xml` from the module :mod:`openupgrade`
       which is included with the OpenUpgrade Server package. You may also have
diff --git a/openerp/osv/orm.py b/openerp/osv/orm.py
index 7c953a512f8f..ebe9408bd97d 100644
--- a/openerp/osv/orm.py
+++ b/openerp/osv/orm.py
@@ -1575,7 +1575,9 @@ def _validate(self, cr, uid, ids, context=None):
                         _("The field(s) `%s` failed against a constraint: %s") % (', '.join(fields), translated_msg)
                 )
         if error_msgs:
-            raise except_orm('ValidateError', '\n'.join(error_msgs))
+            # OpenUpgrade: do not raise for obsolete fields
+            # raise except_orm('ValidateError', '\n'.join(error_msgs))
+            pass
 
     def default_get(self, cr, uid, fields_list, context=None):
         """