PeopleSoft Financials 8.8 vs. 9.0 Delta Training Accounts Payable - Addenda. Financials 9.0 Upgrade Addenda Accounts Payable/Banking . 4. Accounts Payable. 5. Accounts Payable Change Overview. In the transition from PeopleSoft Financials version 7.02 to 8.8 users lost the ability to close a PO voucher. Users were required to use Reversal Vouchers to correct these issues. The upgrade to version 9.0 returns this functionality. Reversal vouchers will no longer be used. .