Servername has been migrated before.

Source:  Policy Migration

Severity:  Warning

Explanation:  The Policy Migration tool migrates the ZENworks 2 Inventory policies only once. This error happens if you are migrating the Inventory policies that have been migrated earlier.

  Previous Page: Inventory Service object does not contain the DN of the Inventory server. Migration will not proceed.  Next Page: Inventory Policy Object policy_object_name has invalid settings setting_name.