Under the Administration tool menu item Invoice - Unlock invoice, there is a function to unlock an invoice that has been locked in the system due to an error.

To unlock a locked invoice, do the following:

1. Open the administration tool by clicking on 
2. Go to the menu item Invoice and the sub-item Unlock Invoice.
3. Enter the Case number on the invoice to be unlocked.
   Case no is available as a column selection in the WorkQueue window and Search/Dashboard, go to Settings in the black menu columnand add the column if you don't see it.
4. Click the Unlock button.