Key in object not propulated from Foreign key listed in reference-descriptor

I have a field in a class called IOS that is not getting populated from
the foreign key definition in the scientist reference-descriptor shown
in IOS class-descriptor.  Here is the class descriptor containing the
field scid that is not getting populated on insertion:

 

<class-descriptor

   class="gov.nih.nidb.persistent.IOS"

   table="NSD.IPID_ORID_SCID"

   >

  <field-descriptor

     name="ipid"

     column="ipid"

     jdbc-type="BIGINT"

     primarykey="true"

     />

  <field-descriptor

     name="scid"

     column="scid"

     jdbc-type="VARCHAR"

     primarykey="true"

     />

  <field-descriptor

     name="orid"

     column="orid"

     jdbc-type="VARCHAR"

     primarykey="true"

     />

  <field-descriptor

     name="order"

     column="orders"

     jdbc-type="Integer"

     />

  <field-descriptor

     name="role"

     column="role"

     jdbc-type="VARCHAR"

     />

  <field-descriptor

     name="modificationDate"

     column="mdate"

     jdbc-type="TIMESTAMP"

     access="readonly"

     />

  <field-descriptor

     name="year"

     column="ryear"

     jdbc-type="INTEGER"

     />

  <field-descriptor

     name="fte"

     column="fte"

     jdbc-type="DOUBLE"

     />

  <reference-descriptor name="report"

                  class-ref="gov.nih.nidb.persistent.Report">

    <foreignkey field-ref="ipid" />

  </reference-descriptor>

  <reference-descriptor name="scientist"

                  class-ref="gov.nih.nidb.persistent.Scientist">

    <foreignkey field-ref="scid" />

  </reference-descriptor>

</class-descriptor>

 

The ipid field is getting populated from the report class correctly.
Does anyone know what the cause of the problem might be?

Jim Wright