This is not the most intuitive message, but it means that you have no other items in your Action List (Cynergy Inbox).
Yes, toward the right side of the action list item, there is s drop-down box, which defaults to NONE. Select FYI from the drop-down, and then click the "take action" button. You can select FYI for multiple items, and then taking action will clear them all.
If the doc is not in your Action List, you cannot take any action other than to send an ad hocrequest, reload, close, and in some cases, copy docs.