To make corrections to a processed expense report, open the expense report and click 
Correct on the toolbar. Note, however, this icon displays only under the following conditions:
The expense report status is Processed.
Your Expense Class or Functional Role allows corrections of expense reports.
Corrections are still allowed based on the number of days that have elapsed since the report was originally processed.
When you click Correct, Deltek Expense validates whether the charges assigned to the report are still active. Depending on permissions set for your Expense Class or Functional Role, you may not be allowed to correct the expense reports unless it contains at least one active charge.
When you correct an expense report, the following happens:
The expense report status is changed to a status of Draft.
The Expense Report Correction No. is increased by one.
The Expense Report Revision number is increased by one.
An audit trail commences and the following information is stored by Deltek Expense:
Text noting that Expense Report was corrected.
The date of the revision
The Login ID of the employee making the revision
An explanation of the revision.
Depending on permissions set by your system administrator for your Expense Class or Functional Role, you may not be allowed to correct the net reimbursement amount of the expense report. In this case, you are not allowed to change the Expense Incurred amount, or any field that would affect it, which by extension, would also change original net reimbursement amount. Therefore, throughout the various wizards, fields that can affect the Expense Incurred amount are disabled and the link for adding expenses is also disabled. See a complete list of disabled fields.
If you are allowed to change the reimbursement amount but have already been paid for the original amount, you will be issued a voucher for the difference between the original and corrected amounts.
When you update certain fields in a correcting expense report, Deltek Expense opens the Revision dialog, where you must enter an explanation for changes made.
When you have completed your changes, sign the report as you normally do. When you sign a corrected expense report that does not contain new expenses, changed expense amounts, or any removed expenses, the User Directed Workflow, Receipt Information, and Due Company tabs do not display.