Very old post, but i had the same problem. Thought it to be of some
value to post the solution here:

1. make a DAL entity nrfResoureRequest with attribute nrfSourceDN
2. Check the already existing DAL entry Resource for CN
3. Use the following Resource Name Override:
IDVault.get(IDVault.get(flowdata.get('nrfResourceR equest/DN'),
'ResourceRequest', 'nrfSourceDN'), 'Resource', 'CN')

You there is some querying in eDir for this, but you will eventually get
to the CN of the requested resource.

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