Composite Key Validation in EOImpl

Hello,
Please anyone can give example of how to validate composite key validation?
I have tried by following in EOImpl code but its not working:
OADBTransaction transaction = getOADBTransaction();
Object[] ItemKey = {getOrganizationId(),getUserId(),getProcess()};
EntityDefImpl def = XxEOImpl.getDefinitionObject();
XxEOImpl item_name = (XxEOImpl)def.findByPrimaryKey(getOADBTransaction(),new Key(ItemKey));
if (item_name != null)
throw new OAException("Erorr duplicate");
Please suggest its urgent..
Thanks,
Swati Thakkar

Hello Gurus,
Can you please suggest the following way of validation is correct or not!?
We have defined primary key on 3 attributes as a composite key, created EO and VO.
Now to add new row we are asking values from user using LOV values.
is the handling of unique value constraint using TooManyObjects Exception valid approach to handle error?
EOImpl Code:
try {
setAttributeInternal(PROCESSTYPE, value);
} catch (TooManyObjectsException toomany) {
throw new OAException("Value is already exist.");
Please suggest the right approach to handling Composite key validation..
Thanks,
Swati

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SQL> desc PRODUCT_CONFIG_OPTION;
Name Null? Type
CONFIG_ITEM_ID NOT NULL VARCHAR2(20) --composite primary key
CONFIG_OPTION_ID NOT NULL VARCHAR2(20) --composite primary key
CONFIG_OPTION_NAME VARCHAR2(100)
DESCRIPTION VARCHAR2(255)
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LAST_UPDATED_TX_STAMP TIMESTAMP(6)
CREATED_STAMP TIMESTAMP(6)
CREATED_TX_STAMP TIMESTAMP(6)
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Name Null? Type
CONFIG_ITEM_ID NOT NULL VARCHAR2(20)
CONFIG_ITEM_TYPE_ID VARCHAR2(20)
CONFIG_ITEM_NAME VARCHAR2(100)
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LONG_DESCRIPTION CLOB
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LAST_UPDATED_TX_STAMP TIMESTAMP(6)
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SQL> desc product;
Name Null? Type
PRODUCT_ID NOT NULL VARCHAR2(20)
PRODUCT_TYPE_ID VARCHAR2(20)
PRIMARY_PRODUCT_CATEGORY_ID VARCHAR2(20)
MANUFACTURER_PARTY_ID VARCHAR2(20)
FACILITY_ID VARCHAR2(20)
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PRODUCT_ID VARCHAR2(20),
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ALTERNATE_PAGE_NUM_TO2 NUMBER(18),
ALTERNATE_PAGE_NUM_TO3 NUMBER(18),
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CREATED_TX_STAMP TIMESTAMP(6),
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CONSTRAINT FK_CONFIG_OPTION_ID FOREIGN KEY (CONFIG_OPTION_ID) REFERENCES PRODUCT_CONFIG_OPTION(CONFIG_OPTION_ID) )
TABLESPACE DATA_SMALL
i try to create this table if i omit 3rd foreign key constraint then table successfully created.but including trd foreign key constraint it return error "ORA-02270: no matching unique or primary key for this column-list"
i checked everything is it possible to create foreign key from composite key in other table.

And
CONSTRAINT FK_CONFIG_OPTION_ID FOREIGN KEY (CONFIG_ITEM_ID,CONFIG_OPTION_ID) REFERENCES PRODUCT_CONFIG_OPTION(CONFIG_ITEM_ID,CONFIG_OPTION_ID)
?

Composite Key Validation in EOImpl

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