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  In order to test to Cancel purchase order from Approved State,I start by creating a new product 'Pen Drive1'
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 !record {model: product.product, id: product_product_pendrive1}:
    categ_id: 'product.product_category_3'
    cost_method: standard
    mes_type: fixed
    name: Pen Drive
    price_margin: 1.0
    procure_method: make_to_order
    property_stock_inventory: stock.location_inventory
    property_stock_procurement: stock.location_procurement
    property_stock_production: stock.location_production
    seller_delay: '1'
    standard_price: 500.0
    supply_method: buy
    type: product
    uom_id: product.product_uom_unit
    uom_po_id: product.product_uom_unit
    volume: 0.0
    warranty: 0.0
    weight: 0.0
    weight_net: 0.0
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  Create second  new product 'Pen Drive2'
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 !record {model: product.product, id: product_product_pendrive2}:
    categ_id: 'product.product_category_3'
    cost_method: standard
    mes_type: fixed
    name: Pen Drive 2
    price_margin: 1.0
    procure_method: make_to_order
    property_stock_inventory: stock.location_inventory
    property_stock_procurement: stock.location_procurement
    property_stock_production: stock.location_production
    seller_delay: '1'
    standard_price: 500.0
    supply_method: buy
    type: product
    uom_id: product.product_uom_unit
    uom_po_id: product.product_uom_unit
    volume: 0.0
    warranty: 0.0
    weight: 0.0
    weight_net: 0.0
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  I create first purchase order for Pen Drive1 where "invoice_method" is From Order.
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  !record {model: purchase.order, id: purchase_order_pendrive1}:
    company_id: base.main_company
    date_order: !eval time.strftime('%Y-%m-%d')
    invoice_method: order
    location_id: stock.stock_location_stock
    order_line:
      - date_planned: !eval time.strftime('%Y-%m-%d')
        name: Pen Drive
        price_unit: 100.0
        product_id: 'product_product_pendrive1'
        product_qty: 10.0
        product_uom: product.product_uom_unit
        state: draft
    partner_address_id: base.res_partner_address_7
    partner_id: base.res_partner_4
    pricelist_id: purchase.list0
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  Initially  purchase order is in the draft state.
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  !assert {model: purchase.order, id: purchase_order_pendrive1}:
    - state == 'draft'
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  I test onchanged on Wharehouse ,Product, Uom, Destination Address .
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  !python {model: purchase.order}: |
    from tools.translate import _
    self.onchange_warehouse_id(cr, uid, [ref("purchase_order_pendrive1")], 1)
    part_obj = self.pool.get('res.partner')
    price_obj = self.pool.get('product.pricelist')
    product_obj = self.pool.get('product.product')
    addrss_obj = self.pool.get('res.partner.address')
    po_line_obj = self.pool.get('purchase.order.line')
    uom_obj = self.pool.get('product.uom')
    price_id = price_obj.search(cr, uid, [('name','=','Default Purchase Pricelist')])
    product_id = product_obj.search(cr, uid, [('name','=','Pen Drive 2')])
    uom_id = uom_obj.search(cr, uid, [('name','=','PCE')])
    part_ids = part_obj.search(cr, uid, [('name','=','Distrib PC')])
    line_id = po_line_obj.search(cr, uid, [('order_id','=',ref("purchase_order_pendrive1"))])
    po_line_obj.product_id_change(cr, uid, line_id[0], price_id[0], product_id[0], 10, uom_id[0], part_ids[0])
    po_line_obj.product_uom_change(cr, uid, line_id[0], price_id[0], product_id[0], 10, uom_id[0], part_ids[0])
    address_id = addrss_obj.search(cr, uid, [('partner_id','=',part_ids)])
    self.onchange_dest_address_id(cr, uid, [ref("purchase_order_pendrive1")], address_id[0])
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  I confirm the purchase order for Pen Drive1.
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  !workflow {model: purchase.order, action: purchase_confirm, ref: purchase_order_pendrive1}
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  I check that the order which was initially in the draft state has transmit to confirm state.
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  !assert {model: purchase.order, id: purchase_order_pendrive1}:
    - state == 'approved'
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  I have to first cancel Picking of Approved Purchase order .
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  !python {model: stock.picking}: |
    from tools.translate import _
    search_ids=self.search(cr, uid, [('purchase_id', '=', ref("purchase_order_pendrive1"))])
    self.action_cancel(cr, uid, search_ids)
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  Now I have to cancel confirm  purchase order for Pen Drive1.
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  !python {model: purchase.order}: |
    self.action_cancel(cr, uid, [ref("purchase_order_pendrive1")])
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  I check that the order which was in approved state has transmit to cancel state.
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  !assert {model: purchase.order, id: purchase_order_pendrive1}:
    - state == 'cancel'
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  Now again set purchase order for Pen Drive1 to draft state.
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  !python {model: purchase.order}: |
    self.action_cancel_draft(cr, uid, [ref("purchase_order_pendrive1")])   
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  I check that the order is in draft state.
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  !assert {model: purchase.order, id: purchase_order_pendrive1}:
    - state == 'draft'
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  I test for Copy and Delete Perchase order in Draft state.
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  !python {model: purchase.order}: |
    from tools.translate import _
    copy_id = self.copy(cr, uid, ref("purchase_order_pendrive1"))   
    self.unlink(cr, uid, [copy_id])