I have a selection field that have 4 value:

'request_state': fields.selection([('buy','buy'),('available_in_stock','available in stock'),('lack_of_liquidity','lack of liquidity') ,('cancel','cancel') ,('disagreement_with_organization','disagreement with organization')], 'request state' )

I want show another field based on  'request_state'  if it is buy OR available_in_stock

 My xml code is

<field name="evaluation" attrs="{'invisible': ['&amp;',('request_state','not in','buy'),('request_state','not in','available_in_stock')}"  />

That work correct but if I use

<field name="evaluation" attrs="{'invisible': ['|',('request_state','not in','buy'),('request_state','not in','available_in_stock')}"  />

That work  and logic (buy and available_in_stock)

my problem is if I use OR  it’s apply and logic and if I use AND it’s apply or logic

* I use openerp v6