In crm.phonecall, I have following new fields.

'x_project_id': fields.many2one('res.partner','Project / Site'),
'x_email': fields.related('x_project_id', 'email', type='char', string='Email',store=False),
'x_proj_state': fields.related('x_project_id', 'state_id', string='Project State',store=False),
 

There is no problem in displaying x_email and x_project_id. However, when I want to get value x_proj_state in my tree view or form view

<field name="x_proj_state"  readonly="1"/>  

then it gives following error

WARNING penerp.osv.orm.browse_record.res.country.state: Field '_asdict' does not exist in object 'browse_record(res.country.state, 53)'

in res.partner state_id is described as fields.many2one('res.country.state','State'),