-$file = \<<EOL;
-datatype,customer_id,verify_amount,verify_netamount,taxzone_id,currency_id,invnumber,taxincluded,archart
+$file = \<<"EOL";
+datatype,customer_id,verify_amount,verify_netamount,taxzone_id,currency_id,invnumber,taxincluded,archart,transdate