User LOV is a UI component that exposes Workflow Directory Services to end-users in Worklfow pages to select a user or a role while performing actions on a notification such as Reassign, Request Information or setting up rules such as Vacation Rules or Worklist Access. By default the User LOV has always provided complete access to all the users and roles in the Directory Services to the end-users regardless of where they belong.
Oracle Workflow has now released a new feature that uses AOL's Data Security features to provide an option for Customers to configure the User LOV to stripe the data as per current user context. This allows certain users to see only certain group of users in the User LOV while accessing workflow notification pages. More information about how to use this feature is available in below My Oracle Support document.
Configuring the Oracle Workflow User List of Values, Release 12.0.6 and Release 12.1.1