Oracle : Ошибка ORA-29383

"all leaves of top-plan %s must be consumer groups"
*Cause: An attempt was made to create or modify the specified top-plan
but it has some plans as leaves.
*Action: To identify which plans and/or plan directives need to be modified,
look at all plans that have no plan directives. Then, alter the
top-plan so that all its leaves are consumer groups.

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