diff --git a/addons/hw_escpos/escpos/printer.py b/addons/hw_escpos/escpos/printer.py
index d52668b50f9..238a69e5fc8 100644
--- a/addons/hw_escpos/escpos/printer.py
+++ b/addons/hw_escpos/escpos/printer.py
@@ -82,7 +82,7 @@ class Usb(Escpos):
 
     def _raw(self, msg):
         """ Print any command sent in raw format """
-        if len(msg) != self.device.write(self.out_ep, msg, self.interface):
+        if len(msg) != self.device.write(self.out_ep, msg, self.interface, timeout=5000):
             self.device.write(self.out_ep, self.errorText, self.interface)
             raise TicketNotPrinted()
     
diff --git a/addons/mass_mailing/wizard/test_mailing.py b/addons/mass_mailing/wizard/test_mailing.py
index b86f4ea32a0..14a87fa10bd 100644
--- a/addons/mass_mailing/wizard/test_mailing.py
+++ b/addons/mass_mailing/wizard/test_mailing.py
@@ -11,7 +11,8 @@ class TestMassMailing(osv.TransientModel):
     _columns = {
         'email_to': fields.char('Recipients', required=True,
             help='Comma-separated list of email addresses.'),
-        'mass_mailing_id': fields.many2one('mail.mass_mailing', 'Mailing', required=True),
+        'mass_mailing_id': fields.many2one(
+            'mail.mass_mailing', 'Mailing', required=True, ondelete='cascade'),
     }
 
     _defaults = {
diff --git a/openerp/addons/test_inherit/tests/test_inherit.py b/openerp/addons/test_inherit/tests/test_inherit.py
index f6057817ee4..8e12b0b7e08 100644
--- a/openerp/addons/test_inherit/tests/test_inherit.py
+++ b/openerp/addons/test_inherit/tests/test_inherit.py
@@ -74,6 +74,12 @@ class test_inherits(common.TransactionCase):
         self.assertIn(daughter, partner_demo.daughter_ids)
 
         # search the partner from the daughter record
+        partners = self.env['res.partner'].search([('daughter_ids', 'like', 'not existing daugther')])
+        self.assertFalse(partners)
+        partners = self.env['res.partner'].search([('daughter_ids', 'not like', 'not existing daugther')])
+        self.assertIn(partner_demo, partners)
+        partners = self.env['res.partner'].search([('daughter_ids', '!=', False)])
+        self.assertIn(partner_demo, partners)
         partners = self.env['res.partner'].search([('daughter_ids', 'in', daughter.ids)])
         self.assertIn(partner_demo, partners)
 
diff --git a/openerp/osv/expression.py b/openerp/osv/expression.py
index 71d5c4303c8..50c6a80b761 100644
--- a/openerp/osv/expression.py
+++ b/openerp/osv/expression.py
@@ -999,7 +999,14 @@ class expression(object):
 
                 if call_null:
                     o2m_op = 'in' if operator in NEGATIVE_TERM_OPERATORS else 'not in'
-                    push(create_substitution_leaf(leaf, ('id', o2m_op, select_distinct_from_where_not_null(cr, column._fields_id, comodel._table)), model))
+                    # determine ids from column._fields_id
+                    if comodel._fields[column._fields_id].store:
+                        ids1 = select_distinct_from_where_not_null(cr, column._fields_id, comodel._table)
+                    else:
+                        ids2 = comodel.search(cr, uid, [(column._fields_id, '!=', False)], context=context)
+                        recs = comodel.browse(cr, SUPERUSER_ID, ids2, {'prefetch_fields': False})
+                        ids1 = recs.mapped(column._fields_id).ids
+                    push(create_substitution_leaf(leaf, ('id', o2m_op, ids1), model))
 
             elif column._type == 'many2many':
                 rel_table, rel_id1, rel_id2 = column._sql_names(model)