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  I try to delete In progress order and check Error Message.
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  !python {model: sale.order}: |
    try:
        self.unlink(cr, uid, [ref("sale_order_1")])
    except Exception,e:
        pass
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  I make duplicate order and delete.
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  !python {model: sale.order}: |
    id = self.copy(cr, uid, ref('sale_order_1'))
    self.unlink(cr, uid, [id])