You can change the version number for a particular ruleset version, whether or not the version which you designate as the new number already exists. The target version belongs to the same ruleset as the source version. All rules, including non-resolved rules, from the source ruleset version become part of the target version. All rules retain their original pzInsKey values, and therefore retain their History.
When the change is complete, the wizard deletes all rules in the source version.