public class OrderHeader  implements java.io.Serializable {


    // Fields   

     private String orderType;
     private Long statusId;
     private Long orderNumber;
     private Long orderGenerated;
     private Long billToId;
     private Long shipToId;
     private Long storeId;
     private Long serviceId;
     private Set<OrderDetail> orderDetails = new HashSet<OrderDetail>();
     private BillTo billToDetails; 


    // Setters/Getters for Association Mappings
   
    public Set<OrderDetail> getOrderDetails() {
       return this.orderDetails;
    }
   
    public void setOrderDetails(Set<OrderDetail> orderDetails) {
       this.orderDetails = orderDetails;
    }
   
    public BillTo getBillToDetails() {
      return billToDetails;
   }


   public void setBillToDetails(BillTo billToDetails) {
      this.billToDetails = billToDetails;
   }

   public String getOrderType() {
        return this.orderType;
    }
   
    public void setOrderType(String orderType) {
        this.orderType = orderType;
    }

    public Long getStatusId() {
        return this.statusId;
    }
   
    public void setStatusId(Long statusId) {
        this.statusId = statusId;
    }

    public Long getOrderNumber() {
        return this.orderNumber;
    }
   
    public void setOrderNumber(Long orderNumber) {
        this.orderNumber = orderNumber;
    }

    public Long getOrderGenerated() {
        return this.orderGenerated;
    }
   
    public void setOrderGenerated(Long orderGenerated) {
        this.orderGenerated = orderGenerated;
    }

    public Long getBillToId() {
        return this.billToId;
    }
   
    public void setBillToId(Long billToId) {
        this.billToId = billToId;
    }

    public Long getShipToId() {
        return this.shipToId;
    }
   
    public void setShipToId(Long shipToId) {
        this.shipToId = shipToId;
    }

    public Long getStoreId() {
        return this.storeId;
    }
   
    public void setStoreId(Long storeId) {
        this.storeId = storeId;
    }

    public Long getServiceId() {
        return this.serviceId;
    }
   
    public void setServiceId(Long serviceId) {
        this.serviceId = serviceId;
    }
   



   public boolean equals(Object other) {
         ....
   }
   
   public int hashCode() {
       .....
   }   
}

public class BillTo implements java.io.Serializable{

   // Fields
     private Long billToId;
     private String address1;
     private String address2;
     private String address3;
     private String address4;
     private String address5;
     private String address6;
     private String zip;
     private String state;
     private String country;
     private String phone;
     private String email;
   
    // Property accessors
      public Long getBillToId() {
      return billToId;
   }

   public void setBillToId(Long billToId) {
      this.billToId = billToId;
   }

    public String getAddress1() {
        return this.address1;
    }
   
    public void setAddress1(String address1) {
        this.address1 = address1;
    }

    public String getAddress2() {
        return this.address2;
    }
   
    public void setAddress2(String address2) {
        this.address2 = address2;
    }

    public String getAddress3() {
        return this.address3;
    }
   
    public void setAddress3(String address3) {
        this.address3 = address3;
    }

    public String getAddress4() {
        return this.address4;
    }
   
    public void setAddress4(String address4) {
        this.address4 = address4;
    }

    public String getAddress5() {
        return this.address5;
    }
   
    public void setAddress5(String address5) {
        this.address5 = address5;
    }

    public String getAddress6() {
        return this.address6;
    }
   
    public void setAddress6(String address6) {
        this.address6 = address6;
    }

    public String getZip() {
        return this.zip;
    }
   
    public void setZip(String zip) {
        this.zip = zip;
    }

    public String getState() {
        return this.state;
    }
   
    public void setState(String state) {
        this.state = state;
    }

    public String getCountry() {
        return this.country;
    }
   
    public void setCountry(String country) {
        this.country = country;
    }

    public String getPhone() {
        return this.phone;
    }
   
    public void setPhone(String phone) {
        this.phone = phone;
    }

    public String getEmail() {
        return this.email;
    }
   
    public void setEmail(String email) {
        this.email = email;
    }
}

<hibernate-mapping>
    <class name="OrderHeader">
      <id name="orderNumber" type="java.lang.Long">
         <column name="D0DOCO" precision="8" scale="0" />
        </id>
      <property name="orderType" type="java.lang.String">
         <column name="D0DCTO" length="2" />
      </property>
      <property name="statusId" type="java.lang.Long">
          <column name="D0STS" precision="5" scale="0" />
      </property>
      <property name="orderGenerated" type="java.lang.Long">
          <column name="D0TRDJ" precision="6" scale="0" />
      </property>
      <property name="shipToId" type="java.lang.Long">
          <column name="D0SHAN" precision="8" scale="0" />
      </property>
      <property name="storeId" type="java.lang.Long">
          <column name="D0URAB" precision="8" scale="0" />
      </property>
      <property name="serviceId" type="java.lang.Long">
          <column name="D0CMC1" precision="8" scale="0" />
      </property>
      <set name="orderDetails" inverse="true" lazy="false" cascade="all">
         <key column="D5DOCO" />
         <one-to-many class="OrderDetail" />
      </set>
      
      <component name="billToDetails" class="BillTo" lazy="true">
         <property name="billToId" column="D0AN8" />
      </component>
    </class>
</hibernate-mapping>

<hibernate-mapping>
    <class name="BillTo">
        <id name="billToId" type="java.lang.Long">
         <column name="D1AN8" precision="8" scale="0" />
      </id>
      <property name="address1" type="java.lang.String">
          <column name="D1ADD1" length="40" />
      </property>
      <property name="address2" type="java.lang.String">
          <column name="D1ADD2" length="40" />
      </property>
      <property name="address3" type="java.lang.String">
          <column name="D1ADD3" length="40" />
      </property>
      <property name="address4" type="java.lang.String">
          <column name="D1ADD4" length="40" />
      </property>
      <property name="address5" type="java.lang.String">
          <column name="D1ADD5" length="40" />
      </property>
      <property name="address6" type="java.lang.String">
          <column name="D1ADD6" length="40" />
      </property>
      <property name="zip" type="java.lang.String">
          <column name="D1ADDZ" length="12" />
      </property>
      <property name="state" type="java.lang.String">
          <column name="D1ADDS" length="3" />
      </property>
      <property name="country" type="java.lang.String">
          <column name="D1CTR" length="3" />
      </property>
      <property name="phone" type="java.lang.String">
          <column name="D1PH1" length="20" />
      </property>
      <property name="email" type="java.lang.String">
          <column name="D1EMAIL" length="40" />
      </property>
    </class>
</hibernate-mapping>

<many-to-one name="billToDetails" class="BillTo" column="D0AN8" lazy="false" />