We observed an issue while clearing an attribute from PX policy in AD user store.
ERROR MESSAGE: Error building action event Failed performing action type action.name.set.user.values ; Index: 0, Size: 0
Release : 14.4.2
Component : CA Identity Manager
Engineering provided a patch which contains identitymanager.jar, replacing it with the existing jar from the machine resolved this issue.
If you are facing the same issue, please create a support ticket and request for a identitymanager.jar which was provided as part of defect DE595509.