I have a document called XYZ which is a subtype of EPM Document in Windchill. As per REST API for EPM document management Domain I can read IBA's on top (Parent) EPM Document but not on its Subtypes. Attributes that I am trying to read are applied on Subtype only and not on its Parent type. REST API available OOTB cannot read these IBA's and seems like limitation of REST API. Also, this seems to be applicable to all other types and not just EPMDocument. Is there are option to read IBA's on Subtypes.? or customized REST API is the only option.?