I'm not sure I totally get where what exactely your problem is. Is it just the GPD? Since complext structure like this should work in 3.2 engine, at least if the variable parent is of type org.dom4j.Element. You can read this in chapter 220.127.116.11 of the 3.2 docs and also have a look at the FieldInstantiatorTest.java in org.jbpm.instantiator package of the tests.
Hi Ronald, you're correct in that my question is related to GPD 3.1 only (the complex structures are working for us in the 3.1 *engine*).
Issue GPD-78 deals with configInfoElements as well, but the problem there is that NO children (even non-complex ones) get added to XML adapters. Becuase of this no XML is created for the children, so this is likely a bug.
Back to the original topic, I haven't posted any bug report regarding complex Action children (yet), as I first was seeking some feedback/ideas about the feasibility of using ConfigInfoElement/ ConfigInfoElementDomAdapter to support complex Action children in GD 3.1 (hopefully that makes sense, if not please ask)