1.Allow user to select a closed/History PO. If a PO is closed in error the user can no longer use it even though there is no liquidation. Maybe a pop up message showing the liquidation status on a history po could come up and ask are you sure you want to use this.

2. Users are very confused about the "All PO Items Received?" selection, instead a pop up message to close the PO would be clearer.
3. Being able to see the remaining balance of the PO on the "Assign PO Detail to Credit Card Detail" screen would be very helpful. Users think the PO Amount is their remaining balance.
4. Don't allow the user to change the account code that is on the PO they selected. If they have multiple accounts it's ok to delete what is not needed but they shouldn't be allowed to add an account code that wasn't previously approved on the PO.
5. Create a hyperlink to the PO for approvers to easily view the details of the PO to confirm they chose the correct one.