Voiding a Ticket in Leader
Logon to IUCS.
Go to the leader sub section
Select the STOP LIST menu item
Bring up your citations and find the one that you would like to void.
Change the STATUS column entry to VOIDED and confirm the change in the dialog box that will appear.
You are done, you may logout or work on anything else in IUCS.
Attached is a PDF with screenshots and the instructions above.