Can you revise this PO.69617 in September, 2015? (By adding item no. 2 in this PO. with the SAME SIZE, UNIT PRICE, Quantity and TOTAL as item no. 1 or Issuing new PO. Number IN SEPTEMBER, 2015). Because our accounting did monthly closing. It means that we can not edit anything for new invoice which will be issued in October, 2015.