Oracle Error ORA-23478: object group “string” is already mastered at string

Oracle Error Message

ORA-23478: object group “string” is already mastered at string

Reason for the Error

There is at least one other materialized view repgroup at the local site with the same group name but a different master site.

Solution

Ensure that all materialized view repgroups at the local site with the same group name have the same master.