I have this situation w/c i don't know what to do about it. The case is this: In class sale_order I have this definition:

...
'sched_lines' : fields.one2many('schedule.schedule','Schedule'),
'factor_lines' : fields.one2many('sale.order.factor','Factor'),

So does, in class account_invoice i also have this definition:

...
'sched_lines' : fields.one2many('schedule.schedule','Schedule'),
'factor_lines' : fields.one2many('sale.order.factor','Factor'),  

Back to class sale_order i override the method manual_invoice ,

        ...
        for sale_order in self.browse(cr,uid,ids,context=context):
            _logger.info("\n\t\t\tFACTOR LINES IN SALE ORDER ... %s"%(str(sale_order.factor_lines)))
            _logger.info("\n\t\t\tHISTORY IN SALE ORDER ... %s"%(str(sale_order.sched_lines)))
            inv_id = self.pool.get('account.invoice').search(cr,uid,[('id','in',[new_inv_ids]),('origin','=',sale_order.name)])
            
            factor_list = self.pool.get('sale.order.factor').search(cr,uid,[('invoice_id','=',inv_id[0])])
            _logger.info("\n\t\t\tfactor_list...%s"%(str(factor_list)))
            factor_lines1 = [factors.id for factors in self.pool.get('sale.order.factor').browse(cr,uid,factor_list,context=context)]
            _logger.info("\n\t\t\tfactor_lines1...%s"%(str(factor_lines1)))
            
            # cr.execute('select id from sale_order_factor where invoice_id = %s', (tuple(inv_id)))
            #---------------- factor_lines1 = map(lambda x: x[0], cr.fetchall())
            # factor_lines1 = [(1,0,[factors.id for factors in sale_order.factor_lines])]
            #--- _logger.info("\n\t\t\tfactor_lines1...%s"%(str(factor_lines1)))
            
            self.pool.get('account.invoice').write(cr,uid,inv_id,{
                                                                  'sched_lines': [(6,0,[sched.id for sched in sale_order.sched_lines])],
                                                                  'factor_lines': [(6,0,[factor.id for factor in sale_order.factor_lines])],#factor_lines1
                                                                  }

what i can't understand is that this statement "[(6,0,[factor.id for factor in sale_order.factor_lines])]" does not work. When i view the invoice it has not populated. It's source, that is the factor_lines in sale_order, is not empty. While this statement "[(6,0,[sched.id for sched in sale_order.sched_lines])]" works fine. What's inside in sched_lines from sale_order is being carried fine. Does anyone can point out what's the missing, if there is any, in my code? I am really stuck in this.

Any help is very much appreciated.