diff --git a/erpnext/buying/doctype/purchase_common/purchase_common.py b/erpnext/buying/doctype/purchase_common/purchase_common.py
index 8cedddf..d09768e 100644
--- a/erpnext/buying/doctype/purchase_common/purchase_common.py
+++ b/erpnext/buying/doctype/purchase_common/purchase_common.py
@@ -3,7 +3,7 @@
 
 from __future__ import unicode_literals
 import frappe
-from frappe.utils import flt
+from frappe.utils import flt, cstr
 from frappe import _
 
 from erpnext.stock.doctype.item.item import get_last_purchase_details
@@ -39,7 +39,7 @@
 					(flt(last_purchase_rate), d.item_code))
 
 	def validate_for_items(self, obj):
-		check_list, chk_dupl_itm=[],[]
+		items = []
 		for d in obj.get("items"):
 			# validation for valid qty
 			if flt(d.qty) < 0 or (d.parenttype != 'Purchase Receipt' and not flt(d.qty)):
@@ -70,31 +70,11 @@
 			if not (obj.doctype=="Material Request" and getattr(obj, "material_request_type", None)=="Material Transfer"):
 				if item[0][1] != 'Yes' and item[0][2] != 'Yes':
 					frappe.throw(_("{0} must be a Purchased or Sub-Contracted Item in row {1}").format(d.item_code, d.idx))
-
-			# list criteria that should not repeat if item is stock item
-			e = [getattr(d, "schedule_date", None), d.item_code, d.description, d.warehouse, d.uom,
-				d.meta.get_field('prevdoc_docname') and d.prevdoc_docname or d.meta.get_field('sales_order_no') and d.sales_order_no or '',
-				d.meta.get_field('prevdoc_detail_docname') and d.prevdoc_detail_docname or '',
-				d.meta.get_field('batch_no') and d.batch_no or '']
-
-			# if is not stock item
-			f = [getattr(d, "schedule_date", None), d.item_code, d.description]
-
-			ch = frappe.db.sql("""select is_stock_item from `tabItem` where name = %s""", d.item_code)
-
-			if ch and ch[0][0] == 'Yes':
-				# check for same items
-				if e in check_list:
-					frappe.throw(_("Item {0} has been entered multiple times with same description or date or warehouse").format(d.item_code))
-				else:
-					check_list.append(e)
-
-			elif ch and ch[0][0] == 'No':
-				# check for same items
-				if f in chk_dupl_itm:
-					frappe.throw(_("Item {0} has been entered multiple times with same description or date").format(d.item_code))
-				else:
-					chk_dupl_itm.append(f)
+			
+			items.append(cstr(d.item_code))
+			if items and len(items) != len(set(items)):
+				frappe.msgprint(_("Warning: Same item has been entered multiple times."))
+			
 
 	def check_for_stopped_status(self, doctype, docname):
 		stopped = frappe.db.sql("""select name from `tab%s` where name = %s and