DGOP3106 The rule-of-thumb cluster cannot be copied because a private rule-of-thumb group does not exist yet.

Explanation
 A rule-of-thumb cluster cannot be copied to a
public rule-of-thumb group. It can only be copied to a private rule-of-thumb
group.

User response
 Create a private rule-of-thumb group and then
copy the rule-of-thumb cluster to it.