The subcomponents Panels and Mullions of Curtain Wall now mapped to IfcBuildingElementProxy in IfcEntity when exported to IFC4 in OpenBuildings. Tried to modify the mapping options in the IFC Export dialog or edit the IFC_PartMapping_ifc4.set to attempt to map to IfcCurtainWallFrame or IfcCurtainWallPanel to IfcEntity. But still the same IfcBuildingElementProxy will be resulted. Suggest an idea to enable the control of IfcEntlty mapping for subcomponents of Curtain Wall.