From 39fe69babe7e2f05330de6829a2843f91a04f440 Mon Sep 17 00:00:00 2001
From: Raphael Collet <rco@openerp.com>
Date: Mon, 17 Dec 2012 14:45:59 +0100
Subject: [PATCH] [FIX] expression: avoid delitem on a tuple

bzr revid: rco@openerp.com-20121217134559-cjc0b4ncs1drupn7
---
 openerp/osv/expression.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/openerp/osv/expression.py b/openerp/osv/expression.py
index cca376994ec..899279c8015 100644
--- a/openerp/osv/expression.py
+++ b/openerp/osv/expression.py
@@ -1104,7 +1104,7 @@ class expression(object):
                 query = '(%s."%s" IS %s)' % (table_alias, left, r)
                 params = []
             elif isinstance(right, (list, tuple)):
-                params = right[:]
+                params = list(right)
                 check_nulls = False
                 for i in range(len(params))[::-1]:
                     if params[i] == False: