Process instance contains not migrated event subscriptions

Hi all,

I like to migrate process instances to the latest version of a process by Cockpit. So I define the mapping, select all instances and execute the migration plan. The migration failed with failure ‘Process instance contains not migrated event subscriptions’. If I validate the migration plan by calling the rest api /migration/validate there is no failure detected. So I try to migrate one instance after the other. Some instances I could migrate and some not. I can’t detect a big diffrences between the instances. The most of them have event subscriptions.

I tried these on camunda BPM v7.7.3.

Is there a way I can migrate the remaining instances? Do I have to define the migration for event subscription?

Best regards,