If a reviewer has done a reassign from a view (without checking out) and then switches to the other view and then try to check out there is an error message
“Some tasks have already been approved by other reviewers. Click OK to refresh the tasks”.
Release : 14.5.1
Component : CA Identity Suite Virtual Appliance
Engineering provided a fix to resolve this issue as part of defect DE620746. It needs to be applied on top of IM vApp 14.5.1 CHF1 environment. If you face the same issue then please create a support ticket and request for the fix.