The system-assigned identifier is a version number that CentraSite maintains for its own internal use. CentraSite automatically assigns this identifier to a policy when the policy is created. You cannot delete it or modify it. A policy's system-assigned identifier is numeric and always has the format MajorVersion.Revision. A policy always begins with a system-assigned version identifier of 1.0. The MajorVersion number is incremented by one each time you create a new version of a policy (for example, 1.0, 2.0, 3.0).

The user-assigned identifier is an optional identifier that you can assign to a distinguish a specific version of a policy. This identifier does not need to be numeric. For example, you might use a value such as "V2.a (beta)" to identify a version.