ORA-08118: Deferred FK constraints cannot be enforced, index too big (string)

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ORA-08118: DeferredFK constraints cannot be enforced, index too big (string)
Cause: Deferred Foreign Key constraints cannot be enforceddue to the index key
being too big and built on a non-default DB_BLOCK_SIZE.
Action: Firsttry to drop the Foreign Key and then the primary key.