exception when seaching child records in an entity bean

[SoftFrance MOODAD Shadi]

Hi every body

My problem:

I'm trying to find the child record related to an entity in a
one-to-many relationship(Solution-->SolutionDetail)
I have the following method in the Solution remoteInterface
   public void getSolutionds(Collection solutionds) throws
RemoteException;

and i have the folowing relationship descriptor in the ejb-jar.xml

<ejb-relation>
    <ejb-relation-name>SolutionDetail</ejb-relation-name>
     <ejb-relationship-role>

<ejb-relationship-role-name>solutiond-belongto-solutionh</ejb-relationship-role-name>

      <multiplicity>many</multiplicity>
      <role-source>
       <ejb-name>Solutiond</ejb-name>
      </role-source>
      <cmr-field>
       <cmr-field-name>solutionh</cmr-field-name>
      </cmr-field>
     </ejb-relationship-role>
     <ejb-relationship-role>

<ejb-relationship-role-name>solutionh-has-solutiond</ejb-relationship-role-name>

      <multiplicity>one</multiplicity>
      <role-source>
       <ejb-name>Solution</ejb-name>
      </role-source>
      <cmr-field>
       <cmr-field-name>solutionds</cmr-field-name>
       <cmr-field-type>java.util.Collection</cmr-field-type>
      </cmr-field>
     </ejb-relationship-role>
    </ejb-relation>

the deployment (under beaWebLogic 6.0) succed but if i use that relation
and the the method "mentioned above" i get a run time execution error

java.rmi.MarshalException: error marshalling return; nested exception
is:
        java.io.NotSerializableException:
solution.SolutionBean_WebLogic_CMP_RDB
MS_solutionds_Set
java.io.NotSerializableException:
solution.SolutionBean_WebLogic_CMP_RDBMS_solut
ionds_Set
        <<no stack trace available>>

thanks a lot for a help

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