Hibernate version: 3
Databese MySql

I'm having trouble creating mapping file for one of the tables.
Relation is one-to-many but the key is multicolumn:

The tables are as following:

CREATE TABLE item
(model_id INTEGER,
item_id INTEGER NOT NULL AUTO_INCREMENT,
type_id INTEGER NOT NULL,
item_name VARCHAR(100),
item_pic VARCHAR(60),
size_type VARCHAR(5),
item_desc TEXT,
PRIMARY KEY (item_id),
KEY (type_id),
KEY (model_id)) ;
ALTER TABLE item ADD CONSTRAINT FK_item_item_type
FOREIGN KEY (type_id) REFERENCES item_type (type_id);
ALTER TABLE item ADD CONSTRAINT FK_item_model
FOREIGN KEY (model_id) REFERENCES model (model_id);

CREATE TABLE item_sc
( item_id INTEGER,
color_id INTEGER,
num_size INTEGER,
char_size VARCHAR(4),
curr_stock INTEGER,
KEY (color_id),
KEY (item_id)) ;

ALTER TABLE item_sc ADD CONSTRAINT FK_item_sc_color_dict
FOREIGN KEY (color_id) REFERENCES color_dict (color_id);
ALTER TABLE item_sc ADD CONSTRAINT FK_item_sc_item
FOREIGN KEY (item_id) REFERENCES item (item_id);

CREATE TABLE color_dict
( color_id INTEGER NOT NULL AUTO_INCREMENT,
color_name VARCHAR(60) NOT NULL,
color_pic VARCHAR(60),
PRIMARY KEY (color_id)) ;

Mapping that I already have is for item and color tables (there are other tables referenced in it of course)

<hibernate-mapping>
<class name="axmar.dao.Item" table="item">
<id name="itemId" column="item_id">
<generator class="native"/>
</id>
<property name="modelId" column="model_id" insert="false" update="false"/>
<property name="itemName" column="item_name"/>
<property name="itemPic" column="item_pic"/>
<property name="sizeType" column="size_type"/>
<property name="itemDesc" column="item_desc"/>
<many-to-one name="type" class="axmar.dao.ItemType" column="type_id" lazy="false"/>
</class>
</hibernate-mapping>

<hibernate-mapping>
<class name="axmar.dao.Color" table="color_dict">
<id name="colorId" column="color_id">
<generator class="native"/>
</id>
<property name="colorName" column="color_name"/>
<property name="colorPic" column="color_pic"/>

</class>
</hibernate-mapping>


How do I map item_sc table where
primary key is item_id+color_id?

What would be the class to map item_sc table?
Like this below ?

public class ItemSc {
private int itemId;
private int colorId;
private int numSize;
private String charSize;
private int currStock;}