If an invoice is in a 'Reconciled' state because it has been Operationally and Financially approved, it can still be 'Reopened' using the [Reopen] button.

This will move the invoice into an 'Open' state.

If nothing is changed and you [Complete] the invoice, it will go back into a Flagged state, assuming that it does not match the PO and Receiving Note.

Note that it will automatically Operationally Approve if you have the permissions to do so.

If the department is changed to one that you are not the Operational Approver and then 'Completed' it will require it is Operationally and Financially Approved again.