Question about EJB 4 edition

[Hussein Baghdadi]

I have been reading EJB 4 edition for RMH.
I have the following question (the following from Jbosscmp file):

  
   <relationships>
      <ejb-relation>
         <ejb-relation-name>Customer-Address</ejb-relation-name>
         <foreign-key-mapping/>
         <ejb-relationship-role>
            <ejb-relationship-role-name>Customer-has-a-Address</ejb-relationship-role-name>
            <key-fields/>
         </ejb-relationship-role>
         <ejb-relationship-role>
            <ejb-relationship-role-name>Address-belongs-to-Customer</ejb-relationship-role-name>
            <key-fields>
               <key-field>
                  <field-name>id</field-name>
                  <column-name>HOME_ADDRESS</column-name>
               </key-field>
            </key-fields>
         </ejb-relationship-role>
      </ejb-relation>
   </relationships>

the customer table contains a field called HOME_ADDRESS (FK) to the address table.
please, look at the following :

  
         <ejb-relationship-role>
            <ejb-relationship-role-name>Address-belongs-to-Customer</ejb-relationship-role-name>
            <key-fields>
               <key-field>
                  <field-name>id</field-name>
                  <column-name>HOME_ADDRESS</column-name>
               </key-field>
            </key-fields>
         </ejb-relationship-role>

in this section he is defining the Address side , right ?
id is id of AddressBean or CustomerBean ?
I am confused because column name contains the foriegn key of customer table while he is defining the Address side.