Usage grid lists all records the current record is linked to. An example would be an Attachment that can be linked to both Items and Exams. The Usage grid for an Attachment record would list all Items and Exams that Attachment is linked to.

Item Usage

Object Description
Attachment The Usage grid lists all Items and Exams the Attachment is linked to.
Item The Usage grid lists all Attachments and Exams (and their descriptions) the Item is linked to.
Item Group The Usage grid lists all Items the Item Group is linked to.
Author The Usage grid lists all Items the Author is linked to.
Competency The Usage grid lists all Items the Author is linked to.
Copyright The Usage grid lists all Items and Exams the Copyright is linked to.
Reference The Usage grid lists all Items the Reference is linked to.