Hello,

_name is used to define object like account.invoice, sale.order, purchase.order, res.users.

You have to define  name field in your columns, If  you don't define name field in column than  need to define field in _rec_name.

For more info please refer the below link.

http://dirtyhandsphp.blogspot.in/2014/09/odooopenerp-recname-and-nameget.html

Thanks.

class StockMove(osv.osv):

_name = 'mrp.stockmove'

_inherit = ['stock.move', 'ir.attachment']

_columns = {

'production_id': fields.many2one('mrp.production', 'Production Order for Produced Products', select=True, copy=False),

'raw_material_production_id': fields.many2one('mrp.production', 'Production Order for Raw Materials', select=True),

'consumed_for': fields.many2one('mrp.stockmove', 'Consumed for', help='Technical field used to make the traceability of produced products'),

}

def check_tracking(self, cr, uid, move, lot_id, context=None):

 .....................................

.............................

In these two inherited class has 'name' field