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."
Release : Data Loss Prevention 15.8+
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".
To resolve:
Engineering is aware of the issue and it will be fixed in a future release.
In the interim, you may consider removing the IDM reference prior to, or during the import process, then re-adding the IDM back to the policy to complete the import.