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   In order to test the cancel flow, I start it from canceling confirmed purchase order.
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  I confirm the purchase order.
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  !workflow {model: purchase.order, action: purchase_confirm, ref: purchase_order_5}
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  I check the "Approved" status  after confirmed RFQ.
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  !assert {model: purchase.order, id: purchase_order_5}:
    - state == 'confirmed'
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  First I cancel  receptions related to this order if order shipped.
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  !python {model: purchase.order}: |
    order = self.browse(cr, uid, ref("purchase_order_5"))
    self.pool.get('stock.picking').action_cancel(cr, uid, [picking.id for picking in  order.picking_ids])
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  I check order status in "Shipping Exception".
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  !python {model: purchase.order}: |
    order = self.browse(cr, uid, ref("purchase_order_5"))
    assert order.state == "except_picking", "order should be in Ship Exception state after cancel shipment"    
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  Now I am able to cancel purchase order.
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  !python {model: purchase.order}: |
    self.action_cancel(cr, uid, [ref("purchase_order_5")])
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  I check that order is cancelled.
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  !assert {model: purchase.order, id: purchase_order_5}:
    - state == 'cancel'
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  After cancel the order, I check that it's related invoice cancelled.
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  !python {model: purchase.order}: |
    order = self.browse(cr, uid, ref("purchase_order_5"))
    assert order.invoice_ids[0].state == "cancel", "order's related invoice should be cancelled"   
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  Now again set cancelled order to draft.
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  !python {model: purchase.order}: |
    self.action_cancel_draft(cr, uid, [ref("purchase_order_5")])
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  Now I again to cancel draft order.
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  !python {model: purchase.order}: |
    self.action_cancel(cr, uid, [ref("purchase_order_5")])
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  I check that order is cancelled.
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  !assert {model: purchase.order, id: purchase_order_5}:
    - state == 'cancel'