After cloning a Symantec Data Loss Prevention (DLP) IDM policy you receive this error:
"Policy References Check
Display unresolved references that may prevent the policy from operating correctly IDM index '<IDM Name>' is missing its source file."
Cloning an existing policy associated with an already indexed IDM causes the IDM reference to increment, thus causing the new incremented IDM to have no "source file".
Release : Data Loss Prevention 15.8+
Moving forward, do not clone any policies connected to an IDM. If cloning of a policy is needed, remove the IDM before cloning the policy. Once cloned, re-add the IDM.
Engineering is aware of the concern and working on a fix