Answer / guest

Cause: An attempt was made to delete a subtree that includes
a plan or consumer group that is part of more than one
top-plan as part of procedure DELETE_PLAN_CASCADE or package
DBMS_RESOURCE_MANAGER. Such a plan or consumer group cannot
be deleted.

Action: Check the ancestors of the plan or consumer group
and make sure it is only part of the top-plan that includes
the subtree being deleted.

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