In ZCM 11 SP 1 we have some workstation-objects with a red ring and slash inside, as symbol in Status-column. When i mouseover the icon, this message appears:

"Message Status: Normal. Device Status: Bundle and/or policy enforcement failed on one or more items."

For testing, i unassigned all bundles/policys and also acknowledged and deleted all messages, but the message above still exist. How can i clear this, so that i have a clear green status-symbol for the workstations?
(Same problem exist for some bundles: all messages acknoledged but red-ring-status-symbol still exist)

Thanks for help - merry christmas and a happy new year