Let me expain step for process this invoice,
Step 1 I received invoice form supplier on 26/08/2013
Step 2 Recorded expense in the system on 03/09/2013
Step 3 Waiting for Management team approve on 23/09/2013.
After that , Payment will be release payment 2 time per month 15 and 25 every month .
I think , this invoice can process payment to supplier on 15/10/2013 .