Oracle : Ошибка ORA-30341

"dropped level has references"
*Cause: An attempt was made to drop a level using the default or RESTRICT
option in a dimension while references to that level remain in the
dimension. References can occur in hierarchies and attributes
within the dimension.

*Action: First remove any referenes to the level prior to dropping it, or
specify the CASCADE option with the DROP LEVEL clause.

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