My company syncs Catia part information to other third part database. I got one request syncs "Instance Title" information. Currently syncs code getting VPMReference to get property such as Part_Number 

VPMRootOccurrence vPMRootOccurrence = (VPMRootOccurrence)CATIA.ActiveEdi
VPMReference vPMReference = vPMRootOccurrence.ReferenceRootOccurrenceOf;

In order to get "Instance title", I need to access to get VPMRepInstance, but I don't know how I can get VPMRepInstance. Can anyone let me know which document I need to look at for this information?