[minor] don't show po / mr buttons if delivered
diff --git a/erpnext/selling/doctype/sales_order/sales_order.js b/erpnext/selling/doctype/sales_order/sales_order.js
index 8b18fcc..7fc127c 100644
--- a/erpnext/selling/doctype/sales_order/sales_order.js
+++ b/erpnext/selling/doctype/sales_order/sales_order.js
@@ -23,12 +23,15 @@
 
 				$.each(cur_frm.doc.items, function(i, item){
 					if(item.delivered_by_supplier == 1 || item.supplier){
-						if(item.qty > flt(item.ordered_qty))
+						if(item.qty > flt(item.ordered_qty)
+							&& item.qty > flt(item.delivered_qty)) {
 							is_delivered_by_supplier = true;
+						}
 					}
 					else{
-						if(item.qty > flt(item.delivered_qty))
+						if(item.qty > flt(item.delivered_qty)) {
 							is_delivery_note = true;
+						}
 					}
 				})