How to insert reference of object in nested table

hi , i have a problem with nested table :
CREATE OR REPLACE TYPE ITEM AS OBJECT
ITEM_ID NUMBER,
ITEM_DES VARCHAR2(4000),
PRODUCT_NO VARCHAR2(15),
PRODUCT_DES VARCHAR2(4000)
CREATE TABLE ITEMS OF ITEM
CONSTRAINT ITEM_PK PRIMARY KEY (ITEM_ID)
CREATE OR REPLACE TYPE BOM AS OBJECT
BOM_ID NUMBER,
ITEM_ID NUMBER,
BOM_PARENT_ID number
create or replace type boms as table of ref bom;
create table bom_table
bom_ids bom,bom_member boms
) nested table bom_member store as bom_childs;
insert into bom_table (bom(1,1,null),null);
insert into bom_table (bom(2,1,1),boms(select ref(t) from bom_table t where t.bom_id=1))
show error.
how i can insert in nested table reference of object
thanks

your table "bom_table" is not an object table or view, and thus you can't create object references to it's rows. you'll need to create an object table or view of "bom" objects, with a corresponding object identifier, and then reference that table/view in your subquery instead.
Gerard

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How to insert reference of object in nested table

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