Связи с вложенными таблицами Oracle

CREATE TABLE T1(
... FOREIGN KEY (a2) REFERENCES T3 (a3)
)...;

CREATE TABLE T4(
... FOREIGN KEY (b4) REFERENCES T1.T2 (b2)
);

CREATE TYPE t_t2 AS object (a2 NUMBER(6), b2 NUMBER( 6));
/
 
CREATE TYPE t_tab_t2 AS TABLE OF t_t2;
/
 
CREATE TABLE t1 (a1 NUMBER(6) PRIMARY KEY, b2 NUMBER, t2 t_tab_t2)
nested TABLE t2 store AS tab_t2 ((PRIMARY KEY (b2)));
/
 
CREATE TABLE t3 (a3 NUMBER(6), b3 NUMBER(6) REFERENCES tab_t2( b2));
/

SQL> INSERT INTO t1 VALUES( 1, 1, t_tab_t2( t_t2( 11, 11), t_t2( 12, 12)));
 
1 ROW created.
 
SQL> INSERT INTO t3 VALUES( 3, 12);
 
1 ROW created.
 
SQL> SELECT t1.a1, t1.b2, z.a2, z.b2 FROM t1, TABLE( t1.t2) z;
 
        A1         B2         A2         B2
---------- ---------- ---------- ----------
         1          1         11         11
         1          1         12         12
 
SQL> SELECT * FROM t3;
 
        A3         B3
---------- ----------
         3         12
 
 
SQL> INSERT INTO t3 VALUES( 4, 4);
INSERT INTO t3 VALUES( 4, 4)
*
ERROR at line 1:
ORA-02291: integrity CONSTRAINT (RXX.SYS_C004461) violated - parent KEY NOT found

CREATE TABLE t1 (a1 NUMBER(6) PRIMARY KEY, b2 NUMBER, t2 t_tab_t2)
nested TABLE t2 store AS tab_t2 ((PRIMARY KEY (b2)));