diff --git a/erpnext/controllers/accounts_controller.py b/erpnext/controllers/accounts_controller.py
index d04143d..a9677b0 100644
--- a/erpnext/controllers/accounts_controller.py
+++ b/erpnext/controllers/accounts_controller.py
@@ -187,9 +187,6 @@
 								if stock_qty != len(get_serial_nos(item.get('serial_no'))):
 									item.set(fieldname, value)
 
-							elif fieldname == "conversion_factor" and not item.get("conversion_factor"):
-								item.set(fieldname, value)
-
 					if ret.get("pricing_rule"):
 						# if user changed the discount percentage then set user's discount percentage ?
 						item.set("discount_percentage", ret.get("discount_percentage"))
diff --git a/erpnext/stock/get_item_details.py b/erpnext/stock/get_item_details.py
index 72a83c6..539e8a5 100644
--- a/erpnext/stock/get_item_details.py
+++ b/erpnext/stock/get_item_details.py
@@ -164,6 +164,15 @@
 
 	warehouse = user_default_warehouse or item.default_warehouse or args.warehouse
 
+	#Set the UOM to the Default Sales UOM or Default Purchase UOM if configured in the Item Master
+	if not args.uom:
+		if args.get('doctype') in ['Quotation', 'Sales Order', 'Delivery Note', 'Sales Invoice']:
+			args.uom = item.sales_uom if item.sales_uom else item.stock_uom
+		elif args.get('doctype') in ['Purchase Order', 'Purchase Receipt', 'Purchase Invoice']:
+			args.uom = item.purchase_uom if item.purchase_uom else item.stock_uom
+		else:
+			args.uom = item.stock_uom
+
 	out = frappe._dict({
 		"item_code": item.name,
 		"item_name": item.item_name,
@@ -178,7 +187,7 @@
 		"batch_no": None,
 		"item_tax_rate": json.dumps(dict(([d.tax_type, d.tax_rate] for d in
 			item.get("taxes")))),
-		"uom": item.stock_uom,
+		"uom": args.uom,
 		"min_order_qty": flt(item.min_order_qty) if args.doctype == "Material Request" else "",
 		"qty": args.qty or 1.0,
 		"stock_qty": args.qty or 1.0,