diff --git a/openerp/addons/base/test/test_osv_expression.yml b/openerp/addons/base/test/test_osv_expression.yml
index e0061135d85..7edea16d7d8 100644
--- a/openerp/addons/base/test/test_osv_expression.yml
+++ b/openerp/addons/base/test/test_osv_expression.yml
@@ -423,11 +423,19 @@
         u1b = res_users.create(cr, uid, {'login': 'dbo2', 'partner_id': p1})
         u2 = res_users.create(cr, uid, {'login': 'rpo', 'partner_id': p2})
         assert [p1] == res_partner.search(cr, uid, [('user_ids', 'in', u1a)]), "o2m IN accept single int on right side"
+        assert [p1] == res_partner.search(cr, uid, [('user_ids', '=', 'Dédé Boitaclou')]), "o2m NOT IN matches none on the right side"
+        assert [] == res_partner.search(cr, uid, [('user_ids', 'in', [10000])]), "o2m NOT IN matches none on the right side"
         assert [p1,p2] == res_partner.search(cr, uid, [('user_ids', 'in', [u1a,u2])]), "o2m IN matches any on the right side"
         all_partners = res_partner.search(cr, uid, [])
         assert (set(all_partners) - set([p1])) == set(res_partner.search(cr, uid, [('user_ids', 'not in', u1a)])), "o2m NOT IN matches none on the right side"
+        # For 8.0: assert (set(all_partners) - set([p1])) == set(res_partner.search(cr, uid, [('user_ids', '!=', 'Dédé Boitaclou')])), "o2m NOT IN matches none on the right side"
         assert (set(all_partners) - set([p1,p2])) == set(res_partner.search(cr, uid, [('user_ids', 'not in', [u1b, u2])])), "o2m NOT IN matches none on the right side"
 
+
+
+
+
+
         # child_of x returns x and its children (direct or not).
         company = self.browse(cr, uid, ref('ymltest_company3'))
         expected = [ref('ymltest_company3'), ref('ymltest_company4')]
diff --git a/openerp/osv/expression.py b/openerp/osv/expression.py
index 722937fb438..5fcba0b8217 100644
--- a/openerp/osv/expression.py
+++ b/openerp/osv/expression.py
@@ -930,6 +930,10 @@ class expression(object):
                             call_null = False
                             o2m_op = 'not in' if operator in NEGATIVE_TERM_OPERATORS else 'in'
                             push(create_substitution_leaf(leaf, ('id', o2m_op, ids2), working_model))
+                        elif operator in ('like', 'ilike', 'in', '='):
+                            # no match found with positive search operator => no result (FALSE_LEAF)
+                            call_null = False
+                            push(create_substitution_leaf(leaf, FALSE_LEAF, working_model))
 
                 if call_null:
                     o2m_op = 'in' if operator in NEGATIVE_TERM_OPERATORS else 'not in'