[CR #454600] If you have used the -u option of the ma_admin utility to upgrade, all of the verifiable Mirror Replication Agent for ASE 12.6 instances to Mirror Replication Agent for ASE 15.0 instances cannot be automatically migrated using the ra_migrate command.
Workaround: Download and install Mirror Replication Agent 15.0 ESD #1 or later. Then, follow the migration instructions provided in the Mirror Replication Agent Primary Database Guide.