diff --git a/erpnext/selling/doctype/sales_order/sales_order.py b/erpnext/selling/doctype/sales_order/sales_order.py
index b91002e..76e2f8b 100755
--- a/erpnext/selling/doctype/sales_order/sales_order.py
+++ b/erpnext/selling/doctype/sales_order/sales_order.py
@@ -216,7 +216,15 @@
 
 	def validate_with_previous_doc(self):
 		super(SalesOrder, self).validate_with_previous_doc(
-			{"Quotation": {"ref_dn_field": "prevdoc_docname", "compare_fields": [["company", "="]]}}
+			{
+				"Quotation": {"ref_dn_field": "prevdoc_docname", "compare_fields": [["company", "="]]},
+				"Quotation Item": {
+					"ref_dn_field": "quotation_item",
+					"compare_fields": [["item_code", "="], ["uom", "="], ["conversion_factor", "="]],
+					"is_child_table": True,
+					"allow_duplicate_prev_row_id": True,
+				},
+			}
 		)
 
 		if cint(frappe.db.get_single_value("Selling Settings", "maintain_same_sales_rate")):