from Order ord left join fetch ord.Rep  where ord.Rep.RepGroup.Code > :code.

    Criteria criteria = session.createCriteria(Order.class);
    criteria  = criteria.setFetchMode("Rep", FetchMode.JOIN);
    criteria = criteria.add(Expression.ge("Order.Rep.RepGroup.Code", repCode));

org.hibernate.QueryException: could not resolve property: Order of: com.myapp.Order

    Criteria criteria = session.createCriteria(Order.class);
    criteria  = criteria.setFetchMode("Rep", FetchMode.JOIN);
    criteria = criteria.add(Expression.ge("Rep.RepGroup.Code", repCode));

org.hibernate.QueryException: could not resolve property: Rep.RepGroup.Code of: com.myapp.Order

    Criteria criteria = session.createCriteria(Order.class);
    criteria  = criteria.setFetchMode("Rep", FetchMode.JOIN);
    criteria = criteria.add(Expression.ge("RepGroup.Code", repCode));

org.hibernate.QueryException: could not resolve property: RepGroup of: com.mypp.Order

Mapping files, Order, Rep & RepGroup

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
   "-//Hibernate/Hibernate Mapping DTD//EN"
   "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" >

<hibernate-mapping package="com.myco">
   <class
      [b]name="Order"[/b]
      table="Order"
   >
      <meta attribute="sync-DAO">false</meta>


      <id
         name="Id"
         type="java.lang.Long"
         column="id"
         unsaved-value="null"
      >
         <generator class="increment"/>
      </id>

      <!-- please tell Joe Hudson that the type 'nchar' could not be resolved.. defaulting to java.lang.String -->
      <property
         name="Order"
         column="order"
         type="java.lang.String"
         not-null="true"
         length="20"
      />

      ..
      ..
       
      <many-to-one
         name="Rep"
         column="repId"
         class="Rep"
         not-null="true"
      >
      </many-to-one>
   </class>   
</hibernate-mapping>

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
   "-//Hibernate/Hibernate Mapping DTD//EN"
   "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" >

<hibernate-mapping package="com.myapp">
   <class
      [b]name="Rep"[/b]
      table="Rep"
   >
      <meta attribute="sync-DAO">false</meta>
      <id
         name="Id"
         type="integer"
         column="id"
      >
         <generator class="increment"/>
      </id>

      <property
         name="Code"
         column="code"
         type="string"
         not-null="true"
         length="10"
      />
..
..
      <many-to-one
         name="RepGroup"
         column="repGroupId"
         class="RepGroup"
         not-null="true"
      >
      </many-to-one>
   

      <set name="Orders" inverse="true">
         <key column="id"/>
         <one-to-many class="Order"/>
      </set>


   </class>   
</hibernate-mapping>


<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
   "-//Hibernate/Hibernate Mapping DTD//EN"
   "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" >

<hibernate-mapping package="com.myapp">
   <class
      [b]name="RepGroup"[/b]
      table="RepGroup"
   >
      <meta attribute="sync-DAO">false</meta>
      <id
         name="Id"
         type="integer"
         column="id"
      >
         <generator class="increment"/>
      </id>

      <property
         name="Code"
         column="code"
         type="string"
         not-null="true"
         length="10"
      />
      <property
         name="Name"
         column="name"
         type="string"
         not-null="true"
         length="50"
      />
   

      <set name="Reps" inverse="true">
         <key column="id"/>
         <one-to-many class="Rep"/>
      </set>


   </class>   
</hibernate-mapping>

Criteria criteria = session.createCriteria(Order.class);
criteria.createCriteria("Rep");
criteria.createCriteria("RepGroup");
criteria.add(Expression.ge("Code", repCode));