diff --git a/erpnext/public/js/controllers/transaction.js b/erpnext/public/js/controllers/transaction.js
index a33b87f..72da3f1 100644
--- a/erpnext/public/js/controllers/transaction.js
+++ b/erpnext/public/js/controllers/transaction.js
@@ -33,7 +33,7 @@
 				item.margin_rate_or_amount = 0;
 				item.rate_with_margin = 0;
 			}
-			item.base_rate_with_margin = item.rate_with_margin * flt(this.frm.doc.conversion_rate);
+			item.base_rate_with_margin = item.rate_with_margin * flt(frm.doc.conversion_rate);
 
 			cur_frm.cscript.set_gross_profit(item);
 			cur_frm.cscript.calculate_taxes_and_totals();