How can I establish many to many unidirectional relationship?

Hi, EJB Fans!
I am an ejb fan too.
This time I am learn ejb2.0 and find very funny in cmr. I think it is a good idea and can do manythings we cann't do or difficult with ejb1.1.
But in many to many relationship, I don't know how to give my tables to entity A and entity B. How can I define tables to make A contains related Bs' information? And so do B. But i think make this table is difficult, because we don't know exactly how many should contains? And this is an examples:
Difine entity A as User, and B as roles such as Administration, user, power user, as we often used in network. A user can have many roles, and roles can allocated to many roles.
Another examples is entity A as person, and B as Department. B container A, and A can join many department as he or she can.
B can find A(s) with which clues?? Methods like this java.util.Collection getAs()
, this collection how can ejb container caculate it out?
It is very myth, even wonderful!
I love java and more like ejbs.

No body reply.
My question is silly or my english is very bad.
Sorry I am chinese-speaking programmer.

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<?xml version="1.0"?>
<!DOCTYPE ejb-jar PUBLIC '-//Sun Microsystems, Inc.//DTD Enterprise JavaBeans 2.0//EN' 'http://java.sun.com/dtd/ejb-jar_2_0.dtd'>
<ejb-jar>
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                    <![CDATA[SELECT OBJECT(a) FROM AA_Supplier AS a WHERE a.name =
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                    <method-name>findAllSuppliers</method-name>
                    <method-params>
                    </method-params>
               </query-method>
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                    <![CDATA[SELECT OBJECT(a) FROM AA_Supplier AS a WHERE a.supplierID
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               <field-name>basePrice</field-name>
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               <field-name>supplierID</field-name>
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          <primkey-field>productID</primkey-field>
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                    <method-name>findByName</method-name>
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               </query-method>
               <ejb-ql>
                    <![CDATA[SELECT OBJECT(a) FROM AA_Product AS a WHERE a.description
                    = ?1]]>
               </ejb-ql>
          </query>
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                    <method-params>
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               <ejb-ql>
                    <![CDATA[SELECT OBJECT(a) FROM AA_Product AS a WHERE a.basePrice =
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               </ejb-ql>
          </query>
          <query>
               <query-method>
                    <method-name>findExpensiveProducts</method-name>
                    <method-params>
                         <method-param>double</method-param>
                    </method-params>
               </query-method>
               <ejb-ql>
                    <![CDATA[SELECT OBJECT(a) FROM AA_Product AS a WHERE a.basePrice >
                    ?1]]>
               </ejb-ql>
          </query>
          <query>
               <query-method>
                    <method-name>findCheapProducts</method-name>
                    <method-params>
                         <method-param>double</method-param>
                    </method-params>
               </query-method>
               <ejb-ql>
                    <![CDATA[SELECT OBJECT(a) FROM AA_Product AS a WHERE a.basePrice <
                    ?1]]>
               </ejb-ql>
          </query>
          <query>
               <query-method>
                    <method-name>findAllProducts</method-name>
                    <method-params>
                    </method-params>
               </query-method>
               <ejb-ql>
                    <![CDATA[SELECT OBJECT(a) FROM AA_Product AS a WHERE a.productID
                    IS NOT NULL]]>
               </ejb-ql>
          </query>
     </entity>
     </enterprise-beans>
     <relationships>
     <ejb-relation>
          <ejb-relation-name>Product Supplier</ejb-relation-name>
          <ejb-relationship-role>
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               <multiplicity>One</multiplicity>
               <relationship-role-source>
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               </relationship-role-source>
               <cmr-field>
                    <cmr-field-name>products</cmr-field-name>
                    <cmr-field-type>java.util.Collection</cmr-field-type>
               </cmr-field>
          </ejb-relationship-role>
          <ejb-relationship-role>
               <ejb-relationship-role-name>Product supplied by Supplier</ejb-relationship-role-name>
               <multiplicity>Many</multiplicity>
               <relationship-role-source>
                    <ejb-name>ProductEJB</ejb-name>
               </relationship-role-source>
          </ejb-relationship-role>
     </ejb-relation>
     </relationships>
     <assembly-descriptor>
          <container-transaction>
          <method>
               <ejb-name>SupplierEJB</ejb-name>
               <method-intf>Remote</method-intf>
               <method-name>*</method-name>
          </method>
          <trans-attribute>Required</trans-attribute>
          </container-transaction>
     </assembly-descriptor>
</ejb-jar>

I think u r some confusion with productID and SuppliedID . primary key of one column( productId ) can be a foreign key of other table colum( SuppliedID). but foreign key( SuppliedID) can not be a primary key of second table .u declared SuppliedId as primary key . so ur mapping is incorrect.

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How can I establish many to many unidirectional relationship?

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