Oracle® Database 11g / 12c / 18c error codes ORA-32816: foreign queue [string] is referenced by a subscriber or schedule

ORA-32816: foreign queue [string] is referenced by a subscriber or schedule

Oracle Error Code: ORA-32816

Cause: An attempt was made to unregister a foreign queue currently referenced by one or more subscribers or propagation schedules.

Action: Remove all subscribers and propagation schedules using this foreign queue and retry the operation.