diff --git a/addons/purchase/test/purchase_order_cancel_draft.yml b/addons/purchase/test/purchase_order_cancel_draft.yml
index b1c8b6ef938..ad8eb1d3508 100644
--- a/addons/purchase/test/purchase_order_cancel_draft.yml
+++ b/addons/purchase/test/purchase_order_cancel_draft.yml
@@ -21,6 +21,29 @@
     warranty: 0.0
     weight: 0.0
     weight_net: 0.0
+-
+  Create second  new product 'Pen Drive2'
+-
+ !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
 -
   In order to test the  purchase order flow,I create a new record where "invoice_method" is From Order.
 -
@@ -47,6 +70,27 @@
 -
   !assert {model: purchase.order, id: purchase_order_pendrive1}:
     - state == 'draft'
+-
+  I test onchanged on Wharehouse ,Product , Uom .
+-
+  !python {model: purchase.order}: |
+    from tools.translate import _
+    ids = []
+    ids.append(ref("purchase_order_pendrive1"))
+    self.onchange_warehouse_id(cr, uid, ids , 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','=',ids[0])])
+    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])
 -
   I confirm the purchase order for Pen Drive1.
 -