With ALC integrated to Harvest you should be able to right-click a package in Harvest Workbench and launch "Open Related Items".
After upgrading the Harvest SCM Client to version 13 Increment 3, that option is no longer available.
CA SCM Harvest v13.3
ALC-Harvest Integration plugin
Please open the CA Harvest SCM Workbench tool and go to Help -> Install New Software to reinstall the ALC-Harvest Integration Plugin. The option to select is "CA ALC Eclipse" -> "CA ALC-Harvest Integration"