The base entry 'base_entry' cannot be added to
the realm_name realm because
the base entry is already defined.
Explanation
The base entry is already participating in a realm. Even if it is in a different
realm, base entries are not allowed to have the same name. A base entry
can only participate in one realm.
Programmer response
Change the name of the base entry to be added, or delete the existing base
entry with the same name.