road hierarchies

 

When running a ukpms pass on carriageway the road hierarchy is used in the processing.  Our system has two attributes in the setup 'NETW' which referes to the hierarchy which one is used in UKPMS
IIT_CHR_ATTRIB60 (ROAD_HIER)
IIT_CHR_ATTRIB34 (RSE_MAINT_CATEGORY)

I would like to adapt the one that is NOT used within UKPMS to identify the back lanes, but did not want to cause problems when processing ukp data.