Overriding datanucleus automatically generated id field

According to:
http://www.datanucleus.org/products/accessplatform_3_0/jdo/datastore_identity.html

If an persistable object doesn't have an id field, datanucleus will automatically generate an id field for. Oh and I hate that !

@DatastoreIdentity(column = "id", strategy = IdGeneratorStrategy.IDENTITY) //Nice, good looking auto-increment id field

But what if that's not the whole view of the case ? I faced this situation when I had my object persisted within the graph of another objects. This case is datanucleus calls it, the compound identity.

http://www.datanucleus.org/products/accessplatform_3_0/jdo/orm/compound_identity.html

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