I want to get the opportunity state in the BOQ projects because I have fields in BOQ want to be shown only in quotation state so I need to get the opportunity state in the BOQ project ,

Now I have this method to return the opportunity state but I have an issue with ids is that must be boq_project_id ? how can I get the boq_project_id because that method rasie ana error :

2015-03-04 10:08:16,893 2372 ERROR EXD-SA openerp.sql_db: bad query: SELECT boq_projects."opportunity_id",boq_projects.id FROM "boq_projects" WHERE boq_projects.id IN ('lang', 'crm_stage', 'tz', 'uid') ORDER BY id.

If I replace the ids with any boq_project id such as : 260 then every thing working good and method return the state successfully.

Could anyone tell me what is the error in my method ?

class boq_projects(osv.osv):

    _name = "boq.projects"

    _description = "BoQ Projects"

    def _opportunity_state(self, cr, uid, ids, context=None):

        reads = self.read(cr, uid, ids, ['opportunity_id'], context)

        opp_id = reads['opportunity_id'][0]

        print opp_id, '@@@@@@@@@@@@@@@@@@@'

        lead_obj = self.pool.get('crm.lead')

        lead = lead_obj.read(cr, uid, opp_id, ['state'])

        print lead,'@@@@@@@@@@@@@@@@@@@'

        return lead['state']

    _columns = {

        .

        .

        .

        .

        'boq_state' : fields.char('state'),

    }

    _defaults = {

        'boq_state': _opportunity_state

    }

THANKS IN ADVANCE