Issue:
User cannot select Include Closed in Issue Parts window.

This also presents in other areas of SedonaOffice that use the function of tying an entry to a Service Ticket.
Resolution:
This is due to permissions.
In SedonaSetup, go to User Groups in the OP area.
Locate the User Group the user who is unable to use Include Closed in Issue Parts to the Service Ticket.
Scroll to the Service area of the User Group permission and locate a permission labeled Select Close Service Tickets for Costing.

Mark the box next to the permission and click Apply to save the change.
Once saved, have the user close SedonaOffice and log back in. They should now be able to access the Include Closed box.