DNG RPE Automatic Stylesheet Heading Numbering not working

When using RPE with old DOORS (9.x etc.) you could create a stylesheet .(doc/.dot) which had numbered headings

1
1.1
1.1.1
etc for the various levels
When the DOORS 9.x module was exported by RPE using the stylesheet it would automatically have the headings numbered to match the DOORS module heading numbers based on heading level.
This was very useful as numbering did not have to be designed in the RPE template.

When I try to do this with DNG 6.0.5 for a DNG module every heading comes out as a level one heading regardless of the heading depth in the DNG module structure.
Is there a way to get the correct heading style (based on level) applied to the headings in a DNG RPE module export?