CMR between three (transient) connected tables

Hi, 
we have taken over an existing programm using ejb1.1 with bea wl6.1. 
Due to performance-reasons we decided to migrate this to ejb2.0 using bea wl8.1. 
However it showed up that wl8.1 with ejb2.0 seems to change the sequence of storing dependend EntityBeans so that we received some ForeignKey-Constraint-Violations. 
Therefor we introduced CMR to enable the container to get control over the relations. We managed to get all the CMRs right except one: 
Tables are: 
Table A(a,b,c,d) PK a,b 
Table B(a,b,m,n) PK a,b,m 
Table A(a,b,x,m) PK a,b,x 
Foreign keys are: 
FK B->A using a & b 
FK C->A using a & b, C->B using a, b & m 
(in words: B extends A, C extends A, C may extend B must does not have to) 
The FK C->B I do not know how to manage via CMR. 
If I try to set the Reference to B within the ejbPostCreate() using setParent(B) I get this Error: 
[EJB:010146]The setXXX method for a cmr-field that is mapped to a primary key may not be called. The cmr-field is read-only. 
If I try not to use the setParent(B) but to set an Reference using setM(m) I get this Error: 
[EJB:010145]When a cmp-field and a cmr-field (relationship) are mapped to the same column, the setXXX method for the cmp-field may not be called. The cmp-field is read-only. 
Is there any way to solve this Problem without changing the Database? 
And yes I know, you should not use compound Keys in EJB...;-) 
Thanks in advance, 
Stephan

Hi Pooyan,
thanks for having an look and answering. I agree, using hibernate could help...
But I was interested in an solution that is will not result in changing the persistance-layer of the whole application (at least not at this moment).
So far we are getting no errors not using cmr for this particular relation, so we are not forced to solve it.
But there is no solution (beside changing the persistance to e.g. hibernate) for such an constellation?
cheers,
Stephan

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<home>fehd.web.util.Kay_tmp_2Home</home>
<remote>fehd.web.util.Kay_tmp_2</remote>
<local-home>fehd.web.util.Kay_tmp_2LocalHome</local-home>
<local>fehd.web.util.Kay_tmp_2Local</local>
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<abstract-schema-name>Kay_tmp_2</abstract-schema-name>
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<cmp-field>
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<description>Entity Bean ( CMP )</description>
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<home>fehd.web.util.Kay_tmp_1Home</home>
<remote>fehd.web.util.Kay_tmp_1</remote>
<local-home>fehd.web.util.Kay_tmp_1LocalHome</local-home>
<local>fehd.web.util.Kay_tmp_1Local</local>
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<field-name>kay_name</field-name>
</cmp-field>
<cmp-field>
<field-name>kay_date</field-name>
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<multiplicity>One</multiplicity>
<cascade-delete/>
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<ejb-name>Kay_tmp_1</ejb-name>
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<cmr-field-type>java.util.Collection</cmr-field-type>
</cmr-field>
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<ejb-relationship-role>
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<relationship-role-source>
<ejb-name>Kay_tmp_2</ejb-name>
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</ejb-relationship-role>
</ejb-relation>
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<?xml version = '1.0' encoding = 'GBK'?>
<!DOCTYPE orion-ejb-jar PUBLIC "-//Evermind//DTD Enterprise JavaBeans 1.1 runtime//EN" "http://xmlns.oracle.com/ias/dtds/orion-ejb-jar.dtd">
<orion-ejb-jar>
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<entity-deployment name="Kay_tmp_1" copy-by-value="false" data-source="jdbc/iasdbDS" exclusive-write-access="false" table="KAY_TMP_1">
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<default-method-access>
<security-role-mapping impliesAll="true" name="<default-ejb-caller-role>"/>
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Have a look at the orion-ejb-jar.xml which is generated by oc4j in the application-deployments dir.
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