diff --git a/erpnext/public/js/controllers/taxes_and_totals.js b/erpnext/public/js/controllers/taxes_and_totals.js
index 1de9ec1..52efbb5 100644
--- a/erpnext/public/js/controllers/taxes_and_totals.js
+++ b/erpnext/public/js/controllers/taxes_and_totals.js
@@ -67,6 +67,8 @@
 
 	calculate_discount_amount: function(){
 		if (frappe.meta.get_docfield(this.frm.doc.doctype, "discount_amount")) {
+			this.calculate_item_values();
+			this.calculate_net_total();
 			this.set_discount_amount();
 			this.apply_discount_amount();
 		}