I want to add a wizard with Many2many field of 'stock.production.lot' displaying only the records with doubled Lot/Serial Number i did the function that get the filtred records 

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class DoublingNumber(models.TransientModel):
_name = 'doubling.number'


double_number_id =fields.Many2many('stock.production.lot' ,string="Numéros en doublant" )

@api.multi
def _default_double_number(self):
    double_record = []
    records =self.env['stock.production.lot'].search([])
    for record in records :
        for record2 in records :
            if record.name == record2.name and record.product_id != record2.product_id :
                double_record.append(record2)
                break
    return double_record

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Now how to display it ??!