Extraction Workflow Architecture V8i - Forward Part mapping in a group model

A DEM drawing definition in v8i uses Forward Part Mapping.
Any parts defined for forward mapping that are in a reference attachment are not re-symbolized as expected...

However, If I open the same group model and part mapping file on XM the drawing extraction is correct.
If I merge the references together in v8i and run the extraction against the Master file only. the re-symbolize works as expected...

Has this functionailty been deprecated in v8i?