ORA-02266: unique/primary keys in table referenced by enabled foreign keys

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ORA-02266: unique/primary keys in table referenced by enabled foreign keys
Cause: An attempt was made to truncate a table with unique or primary keys
referenced by foreign keys enabled in another table. Other operations not allowed
are dropping/truncating a partition of a partitioned table or an ALTER TABLE
EXCHANGE PARTITION.
Action: Before performing the above operations the table, disable the foreign key
constraints in other tables. You can see what constraints are referencing a table by
issuing the following command: SELECT * FROM USER_CONSTRAINTS WHERE
TABLE_NAME = "tabnam";