ORA-02266 Error Code Description:

Error	ORA-02266
Description	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";