diff --git a/public/js/stock_grid_report.js b/public/js/stock_grid_report.js
index 46370d2..495ea43 100644
--- a/public/js/stock_grid_report.js
+++ b/public/js/stock_grid_report.js
@@ -28,9 +28,7 @@
 			var value_diff = (rate * add_qty);
 		
 			if(add_qty)
-				wh.fifo_stack.push([add_qty, sl.incoming_rate, sl.posting_date]);
-				
-			if(sl.serial_no) value_diff = this.get_serialized_value_diff(sl);
+				wh.fifo_stack.push([add_qty, sl.incoming_rate, sl.posting_date]);				
 		} else {
 			// outgoing
 			if(sl.serial_no) {
@@ -113,7 +111,8 @@
 		$.each(wn.report_dump.data["Stock Ledger Entry"], function(i, sle) {
 			if(sle.qty > 0 && sle.serial_no) {
 				$.each(sle.serial_no.trim().split("\n"), function(i, sr) {
-					if(sr && sle.incoming_rate !== undefined) {
+					if(sr && sle.incoming_rate !== undefined 
+							&& !serialized_buying_rates[sr.trim().toLowerCase()]) {
 						serialized_buying_rates[sr.trim().toLowerCase()] = flt(sle.incoming_rate);
 					}
 				});