I put in 9 invoices yesterday.  One has been returned stating that it does not match the expense type - the only issue with this is it is EXACTLY the same type of invoice I put in with EXACTLY the same expense type.  I have just resubmitted - and hope someone with glasses looks at it properly this time.  I stick by my assertion that the audit is a complete and utter waste of time, it is something just to give someone a job to do - and often doing it poorly.