How to update the foreign key in a 1-to-many relation ?

I have Product mapped to Channel as 1-1, and Channel mapped to Product as 1-M. Product has a nullable channel_id_fk as a foreign key to Channel, (so one can optionally specify or change the channel of a specific product).
Starting with a specific product with a null channel_id_fk, I
1) add this product to a channel (with a vector of products via ValueHolderInterface);
2) set the channel of this product; and
3) update the channel in a unit-of-work.
The product.channel_id_fk doesn't get updated in db.
I tried setting each side of the relation as read-only, but still it doesn't work.
What am I missing ?
(I am using toplink 9.0.4)

More info:
1) There is only a single uow involved, so there is no nested transaction.
2) I tried checking the "target foriegn key" in the 1-1 mapping from Product to Channel, but this resulted in a exception thrown during runtime when the channel is accessed from the product:
Local Exception Stack:
Exception [TOPLINK-6094] (OracleAS TopLink - 10g (9.0.4) (Build 031126)): oracle.toplink.exceptions.QueryException
Exception Description: The parameter name [AFFINITY_CHANNEL_ID_FK] in the query's selection criteria does not match any parameter name defined in the query.
Query: ReadObjectQuery(au.com.agl.application.scorecard.AffinityChannel)
     at oracle.toplink.exceptions.QueryException.parameterNameMismatch(QueryException.java:658)
     at oracle.toplink.internal.expressions.ParameterExpression.getValue(ParameterExpression.java:149)
     at oracle.toplink.queryframework.SQLCall.translate(SQLCall.java:334)
     at oracle.toplink.internal.queryframework.CallQueryMechanism.executeCall(CallQueryMechanism.java:129)
     at oracle.toplink.internal.queryframework.CallQueryMechanism.executeCall(CallQueryMechanism.java:111)
     at oracle.toplink.internal.queryframework.CallQueryMechanism.selectOneRow(CallQueryMechanism.java:584)
     at oracle.toplink.internal.queryframework.ExpressionQueryMechanism.selectOneRowFromTable(ExpressionQueryMechanism.java:792)
     at oracle.toplink.internal.queryframework.ExpressionQueryMechanism.selectOneRow(ExpressionQueryMechanism.java:763)
     at oracle.toplink.queryframework.ReadObjectQuery.execute(ReadObjectQuery.java:340)
     at oracle.toplink.queryframework.DatabaseQuery.execute(DatabaseQuery.java:498)
     at oracle.toplink.queryframework.ReadQuery.execute(ReadQuery.java:111)
     at oracle.toplink.publicinterface.Session.internalExecuteQuery(Session.java:1968)
     at oracle.toplink.threetier.ServerSession.internalExecuteQuery(ServerSession.java:629)
     at oracle.toplink.publicinterface.Session.executeQuery(Session.java:1096)
     at oracle.toplink.internal.indirection.QueryBasedValueHolder.instantiate(QueryBasedValueHolder.java:52)
     at oracle.toplink.internal.indirection.DatabaseValueHolder.getValue(DatabaseValueHolder.java:63)
     at au.com.agl.application.scorecard.ProductDetails.getExclusiveAffinityChannel(ProductDetails.java:69)
....

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