Oracle Database 10g Enterprise Edition Release 10.1.0.3.0
Hibernate version:3.0.5

Can't create mapping for tables:

CREATE TABLE USER
( "DCODE" NUMBER NOT NULL ENABLE,
"ECODE" NUMBER NOT NULL ENABLE,
"MCODE" VARCHAR2(10) NOT NULL ENABLE,
"UNAME" VARCHAR2(100),
CONSTRAINT "PK_USER" PRIMARY KEY ("DCODE", "ECODE", "MCODE")

CONSTRAINT FK_USER_OFFICE FOREIGN KEY ("DCODE", "MCODE")
REFERENCES OFFICE ("CODE", "MCODE") ENABLE

CREATE TABLE OFFICE
( "CODE" NUMBER NOT NULL ENABLE,
"MCODE" VARCHAR2(10) NOT NULL ENABLE,
CONSTRAINT "PK_OFFICE" PRIMARY KEY ("CODE", "MCODE")

Use MyEclipse 4.0, generate:

OFFICE.hbm.xml
-------------------------------------------------------------
<hibernate-mapping package="......">

<class name="OFFICE" table="OFFICE">
<composite-id name="id" class="OfficeKey">
<key-property name="code" column="CODE" type="java.lang.Long"/>
<key-property name="mcode" column="MCODE" type="java.lang.String"/>
</composite-id>

<set name="UserSet" inverse="true">
<key column="DCODE"/>
<one-to-many class="USER"/>
</set>

<set name="UserSet1" inverse="true">
<key column="MCODE"/>
<one-to-many class="USER"/>
</set>
</class>

</hibernate-mapping>
-------------------------------------------------------------

and

USER.hbm.xml
-------------------------------------------------------------
<hibernate-mapping package="....">

<class name="USER" table="USER">
<composite-id name="id" class="UserKey">
<key-many-to-one name="office" column="DCODE" class="OFFICE"/>
<key-property name="ecode" column="ECODE" type="java.lang.Long"/>
<key-many-to-one name="office1" column="MCODE" class="OFFICE"/>
</composite-id>
........
</hibernate-mapping>
-------------------------------------------------------------

i change USER.hbm.xml to :

-------------------------------------------------------------
<hibernate-mapping package="....">

<class name="USER" table="USER">
<composite-id name="id" class="UserKey">
<key-many-to-one name="OFFICE" class="OFFICE">
<column name="CODE"/>
<column name="MCODE"/>
</key-many-to-one>
<key-property name="ecode" column="ECODE" type="java.lang.Long"/>
</composite-id>
-------------------------------------------------------------

error:
%%%% Error Creating SessionFactory %%%%
org.hibernate.MappingException: Foreign key (FKF8AB675E31EB7FDF:USER [MCODE])) must have same number of columns as the referenced primary key (OFFICE [CODE,MCODE])
at org.hibernate.mapping.ForeignKey.alignColumns(ForeignKey.java:86)
at org.hibernate.mapping.ForeignKey.setReferencedTable(ForeignKey.java:51)
at org.hibernate.cfg.Configuration.secondPassCompileForeignKeys(Configuration.java:976)
at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:921)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:999)


After read FAQ, try change USER.hbm.xml :
------------------------------------------------------------------
<hibernate-mapping package=".....">

<class name="USER" table="USER">
<composite-id name="id" class="UserKey">
<key-property name="DCODE" column="DCODE" type="java.lang.Long"/>
<key-property name="MCODE" column="MCODE" type="java.lang.String"/>
<key-property name="ECODE" column="ECODE" type="java.lang.Long"/>
</composite-id>

<many-to-one name="office" class="OFFICE" insert="false" update="false">
<column name="CODE"/>
<column name="MCODE"/>
</many-to-one>
........
</hibernate-mapping>
--------------------------------------------------------


%%%% Error Creating SessionFactory %%%%
org.hibernate.MappingException: Foreign key (FKF8AB675E31EB7FDF:USER [MCODE])) must have same number of columns as the referenced primary key (OFFICE [CODE,MCODE])
at org.hibernate.mapping.ForeignKey.alignColumns(ForeignKey.java:86)
at org.hibernate.mapping.ForeignKey.setReferencedTable(ForeignKey.java:51)
at org.hibernate.cfg.Configuration.secondPassCompileForeignKeys(Configuration.java:976)
at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:921)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:999)

How-to configure mapping many-to-one relation with composite key ?