hi all, i see "default parameter " on def copy.

def copy(self, cr, uid, id, default=None, context=None):

if default is None:

default = {}

default = default.copy()

picking_obj = self.browse(cr, uid, id, context=context)

move_obj=self.pool.get('stock.move')

if ('name' not in default) or (picking_obj.name=='/'):

seq_obj_name = 'stock.picking.' + picking_obj.type

default['name'] = self.pool.get('ir.sequence').get(cr, uid, seq_obj_name)

default['origin'] = ''

default['backorder_id'] = False

if picking_obj.invoice_state == 'invoiced':

default['invoice_state'] = '2binvoiced'

res=super(stock_picking, self).copy(cr, uid, id, default, context)

if res:

picking_obj = self.browse(cr, uid, res, context=context)

for move in picking_obj.move_lines:

move_obj.write(cr, uid, [move.id], {'tracking_id': False,'prodlot_id':False, 'move_history_ids2': [(6, 0, [])], 'move_history_ids': [(6, 0, [])]})

return res

what is the argument of default parameter will be copy.

thanks for help