domain like ['|',('ref','=','res.partner,1'),('ref2','=','res.partner,1')] fails on relate button

'|' ,'&", etc operators are not not working on the client side when used with the relate button.

<act_window name="Email Interface"
    domain="[ '|', ('ref','=','res.partner,%d'%active_id)),('ref2','=','res.partner,%d'%active_id))]"
    res_model="crm.case"
    src_model="res.partner"
    id="tinyoutlook1"/>

Traceback (most recent call last):
  File "/home/npa/openerp/stable/client/bin/widget/view/form.py", line 187, in _action
    value = obj._exec_action(act, data, context)
  File "/home/npa/openerp/stable/client/bin/modules/action/main.py", line 128, in _exec_action
    limit=datas['limit'], auto_refresh=datas['auto_refresh'])
  File "/home/npa/openerp/stable/client/bin/modules/gui/window/__init__.py", line 51, in create
    auto_refresh=auto_refresh)
  File "/home/npa/openerp/stable/client/bin/modules/gui/window/form.py", line 137, in __init__
    self.screen.search_filter()
  File "/home/npa/openerp/stable/client/bin/widget/screen/screen.py", line 180, in search_filter
    v.extend((key, op, value) for key, op, value in self.domain if key not in filter_keys and not (key=='active' and self.context.get('active_test', False)))
  File "/home/npa/openerp/stable/client/bin/widget/screen/screen.py", line 180, in <genexpr>
    v.extend((key, op, value) for key, op, value in self.domain if key not in filter_keys and not (key=='active' and self.context.get('active_test', False)))
ValueError: need more than 1 value to unpack