sql - 参照オラクルの更新方法

Question

参照 M:M で 2 つのオブジェクト テーブルを作成しています。挿入は正しく機能していますが、参照を更新しようとするとエラーが発生します。

エラー: SQL エラー: ORA-00904: "A"."ATS_PN": "%s: 無効な識別子"

CREATE OR REPLACE TYPE STUDENTI AS OBJECT(
    S_NUM   INT,
    S_UZV   VARCHAR2(30)
);

CREATE OR REPLACE TYPE PASNIEDZEJI AS OBJECT(
    P_NUM   INT,
    P_UZV   VARCHAR2(30)
);

CREATE OR REPLACE TYPE ATS_ST AS OBJECT(
    ID  INT,
    ST_ID REF STUDENTI
);

CREATE OR REPLACE TYPE ATS_PN AS OBJECT(
    ID  INT,
    PN_ID REF PASNIEDZEJI
);

CREATE OR REPLACE TYPE ATS_P AS TABLE OF ATS_PN;
CREATE OR REPLACE TYPE ATS_S AS TABLE OF ATS_ST;

CREATE OR REPLACE TYPE O_STUDENTI AS OBJECT(
    STUD STUDENTI,
    PASN ATS_P
);

CREATE OR REPLACE TYPE O_PASNIEDZEJI AS OBJECT(
    PASN PASNIEDZEJI,
    STUD ATS_S
);

CREATE TABLE T_STUDENTI OF O_STUDENTI
NESTED TABLE PASN STORE AS P_TBL;

CREATE TABLE T_PASNIEDZEJI OF O_PASNIEDZEJI
NESTED TABLE STUD STORE AS S_TBL;

INSERT INTO T_STUDENTI VALUES (STUDENTI(191, 'BRONES'), NULL);

INSERT INTO T_PASNIEDZEJI VALUES (PASNIEDZEJI(53, 'JHONES'), NULL);
INSERT INTO T_PASNIEDZEJI VALUES (PASNIEDZEJI(54, 'HIKKAEV'), NULL);

UPDATE T_STUDENTI A SET A.PASN = (1, 'TEST') WHERE A.STUD.S_NUM = 191; --misstake some where ther :/