item data fix for default supplier, exception handling for purchase order
diff --git a/erpnext/demo/data/item.json b/erpnext/demo/data/item.json
index 908de15..e77d8cb 100644
--- a/erpnext/demo/data/item.json
+++ b/erpnext/demo/data/item.json
@@ -1,9 +1,9 @@
 [
  {
-  "default_supplier": "Asiatic Solutions",
-  "item_defaults": [{
-      "default_warehouse": "Stores"
-  }],
+	"item_defaults": [{
+		"default_supplier": "Asiatic Solutions",
+		"default_warehouse": "Stores"
+	  }],
   "description": "For Upper Bearing",
   "image": "/assets/erpnext_demo/images/disc.png",
   "item_code": "Disc Collars",
@@ -11,9 +11,9 @@
   "item_name": "Disc Collars"
  },
  {
-  "default_supplier": "Nan Duskin",
-  "item_defaults": [{
-      "default_warehouse": "Stores"
+	"item_defaults": [{
+		"default_supplier": "Nan Duskin",
+		"default_warehouse": "Stores"
   }],
   "description": "CAST IRON, MCMASTER PART NO. 3710T13",
   "image": "/assets/erpnext_demo/images/bearing.jpg",
@@ -22,9 +22,9 @@
   "item_name": "Bearing Block"
  },
  {
-  "default_supplier": null,
-  "item_defaults": [{
-      "default_warehouse": "Finished Goods"
+	"item_defaults": [{
+		"default_supplier": null,
+		"default_warehouse": "Finished Goods"
   }],
   "description": "Wind Mill C Series for Commercial Use 18ft",
   "image": "/assets/erpnext_demo/images/wind-turbine-2.png",
@@ -33,9 +33,9 @@
   "item_name": "Wind MIll C Series"
  },
  {
-  "default_supplier": null,
-  "item_defaults": [{
-      "default_warehouse": "Finished Goods"
+	"item_defaults": [{
+		"default_supplier": null,
+		"default_warehouse": "Finished Goods"
   }],
   "description": "Wind Mill A Series for Home Use 9ft",
   "image": "/assets/erpnext_demo/images/wind-turbine.png",
@@ -44,9 +44,9 @@
   "item_name": "Wind Mill A Series"
  },
  {
-  "default_supplier": null,
-  "item_defaults": [{
-      "default_warehouse": "Finished Goods"
+	"item_defaults": [{
+		"default_supplier": null,
+		"default_warehouse": "Finished Goods"
   }],
   "description": "Small Wind Turbine for Home Use\n\n\n<!-- html -->",
   "image": "/assets/erpnext_demo/images/wind-turbine-1.jpg",
@@ -60,9 +60,9 @@
   ]
  },
  {
-  "default_supplier": "HomeBase",
-  "item_defaults": [{
-      "default_warehouse": "Stores"
+	"item_defaults": [{
+		"default_supplier": "HomeBase",
+		"default_warehouse": "Stores"
   }],
   "description": "1.5 in. Diameter x 36 in. Mild Steel Tubing",
   "image": null,
@@ -71,9 +71,9 @@
   "item_name": "Bearing Pipe"
  },
  {
-  "default_supplier": "New World Realty",
-  "item_defaults": [{
-      "default_warehouse": "Stores"
+	"item_defaults": [{
+		"default_supplier": "New World Realty",
+		"default_warehouse": "Stores"
   }],
   "description": "1/32 in. x 24 in. x 47 in. HDPE Opaque Sheet",
   "image": null,
@@ -82,9 +82,9 @@
   "item_name": "Wing Sheet"
  },
  {
-  "default_supplier": "Eagle Hardware",
-  "item_defaults": [{
-      "default_warehouse": "Stores"
+	"item_defaults": [{
+		"default_supplier": "Eagle Hardware",
+		"default_warehouse": "Stores"
   }],
   "description": "3/16 in. x 6 in. x 6 in. Low Carbon Steel Plate",
   "image": null,
@@ -93,9 +93,9 @@
   "item_name": "Upper Bearing Plate"
  },
  {
-  "default_supplier": "Asiatic Solutions",
-  "item_defaults": [{
-      "default_warehouse": "Stores"
+	"item_defaults": [{
+		"default_supplier": "Asiatic Solutions",
+		"default_warehouse": "Stores"
   }],
   "description": "Bearing Assembly",
   "image": null,
@@ -104,9 +104,9 @@
   "item_name": "Bearing Assembly"
  },
  {
-  "default_supplier": "HomeBase",
-  "item_defaults": [{
-      "default_warehouse": "Stores"
+	"item_defaults": [{
+		"default_supplier": "HomeBase",
+		"default_warehouse": "Stores"
   }],
   "description": "3/4 in. x 2 ft. x 4 ft. Pine Plywood",
   "image": null,
@@ -116,9 +116,9 @@
   "is_sub_contracted_item": 1
  },
  {
-  "default_supplier": "Scott Ties",
-  "item_defaults": [{
-      "default_warehouse": "Stores"
+	"item_defaults": [{
+		"default_supplier": "Scott Ties",
+		"default_warehouse": "Stores"
   }],
   "description": "N/A",
   "image": null,
@@ -127,9 +127,9 @@
   "item_name": "Stand"
  },
  {
-  "default_supplier": "Eagle Hardware",
-  "item_defaults": [{
-      "default_warehouse": "Stores"
+	"item_defaults": [{
+		"default_supplier": "Eagle Hardware",
+		"default_warehouse": "Stores"
   }],
   "description": "1 in. x 3 in. x 1 ft. Multipurpose Al Alloy Bar",
   "image": null,
@@ -138,9 +138,9 @@
   "item_name": "Bearing Collar"
  },
  {
-  "default_supplier": "Eagle Hardware",
-  "item_defaults": [{
-      "default_warehouse": "Stores"
+	"item_defaults": [{
+		"default_supplier": "Eagle Hardware",
+		"default_warehouse": "Stores"
   }],
   "description": "1/4 in. x 6 in. x 6 in. Mild Steel Plate",
   "image": null,
@@ -149,9 +149,9 @@
   "item_name": "Base Bearing Plate"
  },
  {
-  "default_supplier": "HomeBase",
-  "item_defaults": [{
-      "default_warehouse": "Stores"
+	"item_defaults": [{
+		"default_supplier": "HomeBase",
+		"default_warehouse": "Stores"
   }],
   "description": "15/32 in. x 4 ft. x 8 ft. 3-Ply Rtd Sheathing",
   "image": null,
@@ -160,9 +160,9 @@
   "item_name": "External Disc"
  },
  {
-  "default_supplier": "Eagle Hardware",
-  "item_defaults": [{
-      "default_warehouse": "Stores"
+	"item_defaults": [{
+		"default_supplier": "Eagle Hardware",
+		"default_warehouse": "Stores"
   }],
   "description": "1.25 in. Diameter x 6 ft. Mild Steel Tubing",
   "image": null,
@@ -171,9 +171,9 @@
   "item_name": "Shaft"
  },
  {
-  "default_supplier": "Ks Merchandise",
-  "item_defaults": [{
-      "default_warehouse": "Stores"
+	"item_defaults": [{
+		"default_supplier": "Ks Merchandise",
+		"default_warehouse": "Stores"
   }],
   "description": "1/2 in. x 2 ft. x 4 ft. Pine Plywood",
   "image": null,
@@ -182,9 +182,9 @@
   "item_name": "Blade Rib"
  },
  {
-  "default_supplier": "HomeBase",
-  "item_defaults": [{
-      "default_warehouse": "Stores"
+	"item_defaults": [{
+		"default_supplier": "HomeBase",
+		"default_warehouse": "Stores"
   }],
   "description": "For Bearing Collar",
   "image": null,
@@ -193,9 +193,9 @@
   "item_name": "Internal Disc"
  },
  {
-  "default_supplier": null,
-  "item_defaults": [{
-      "default_warehouse": "Finished Goods"
+	"item_defaults": [{
+		"default_supplier": null,
+		"default_warehouse": "Finished Goods"
   }],
   "description": "Small Wind Turbine for Home Use\n\n\n<!-- html -->\n<p>Size: Small</p>",
   "image": "/assets/erpnext_demo/images/wind-turbine-1.jpg",
@@ -212,9 +212,9 @@
   ]
  },
  {
-  "default_supplier": null,
-  "item_defaults": [{
-      "default_warehouse": "Finished Goods"
+	"item_defaults": [{
+		"default_supplier": null,
+		"default_warehouse": "Finished Goods"
   }],
   "description": "Small Wind Turbine for Home Use\n\n\n<!-- html -->\n<p>Size: Medium</p>",
   "image": "/assets/erpnext_demo/images/wind-turbine-1.jpg",
@@ -231,9 +231,9 @@
   ]
  },
  {
-  "default_supplier": null,
-  "item_defaults": [{
-      "default_warehouse": "Finished Goods"
+	"item_defaults": [{
+		"default_supplier": null,
+		"default_warehouse": "Finished Goods"
   }],
   "description": "Small Wind Turbine for Home Use\n\n\n<!-- html -->\n<p>Size: Large</p>",
   "image": "/assets/erpnext_demo/images/wind-turbine-1.jpg",
@@ -257,9 +257,9 @@
   "item_name": "Wind Mill A Series with Spare Bearing"
  },
  {
-  "default_supplier": "HomeBase",
-  "item_defaults": [{
-      "default_warehouse": "Stores"
+	"item_defaults": [{
+		"default_supplier": "HomeBase",
+		"default_warehouse": "Stores"
   }],
   "description": "3/4 in. x 2 ft. x 4 ft. Pine Plywood",
   "image": null,
diff --git a/erpnext/demo/user/purchase.py b/erpnext/demo/user/purchase.py
index 781c304..822a4fc 100644
--- a/erpnext/demo/user/purchase.py
+++ b/erpnext/demo/user/purchase.py
@@ -51,7 +51,7 @@
 	# get supplier details
 	supplier = get_random("Supplier")
 
-	company_currency = frappe.get_cached_value('Company',  "Wind Power LLC",  "default_currency")
+	company_currency = frappe.get_cached_value('Company', "Wind Power LLC", "default_currency")
 	party_account_currency = get_party_account_currency("Supplier", supplier, "Wind Power LLC")
 	if company_currency == party_account_currency:
 		exchange_rate = 1
@@ -80,14 +80,18 @@
 		report = "Requested Items To Be Ordered"
 		for row in query_report.run(report)["result"][:how_many("Purchase Order")]:
 			if row[0] != "'Total'":
-				po = frappe.get_doc(make_purchase_order(row[0]))
-				po.supplier = supplier
-				po.currency = party_account_currency or company_currency
-				po.conversion_rate = exchange_rate
-				po.transaction_date = frappe.flags.current_date
-				po.insert()
-				po.submit()
-				frappe.db.commit()
+				try:
+					po = frappe.get_doc(make_purchase_order(row[0]))
+					po.supplier = supplier
+					po.currency = party_account_currency or company_currency
+					po.conversion_rate = exchange_rate
+					po.transaction_date = frappe.flags.current_date
+					po.insert()
+					po.submit()
+				except Exception:
+					pass
+				else:
+					frappe.db.commit()
 
 	if random.random() < 0.5:
 		make_subcontract()