tweak order_summary and receipt bill pdfs

app/pdf/receipt_bill_pdf.rb

@@ -252,7 +252,7 @@ class ReceiptBillPdf < Prawn::Document
         show_price  = Lookup.find_by_lookup_type("show_price")
         sale_items.each do |item|
             # check for item not to show
-
+          
             if item.status != 'Discount' && item.qty > 0
                 if !show_price.nil? && show_price.value.to_i > 0 && item.price == 0
                     total_qty    += item.qty
@@ -263,6 +263,10 @@ class ReceiptBillPdf < Prawn::Document
                 end
             end
 
+            if item.qty < 0 && item.status == 'void'
+              total_qty    += item.qty
+            end
+
             product_name  = item.product_name
 
             # if item.status = 'promotion' && (item.remark =='promotion nett price' || item.remark == 'promotion discount')