When exporting a file from AECOsim Building Designer to IFC format, you can choose from 4 different Model View Definitions. If options 1, 2 or 4 are chosen, when opening the export file in IFC Viewer software, the Space Attribute data is presented twice.
The duplicate data can appear under Architectural Space, Space Parameters, Quantities, etc. and this may cause some confusion.This duplication occurs as both Dataset Default Data and User Defined Data are exported. Screenshots from the mostly used IFC Viewer software are shown below.
Each export method follows a different standard. To eliminate the duplication you should consider the option 3 of Model View Definition: IFC2x3 Facilities Management Handover.
Please refer the screenshots attached from the same IFC viewer software once we export using above mentioned method.
Each IFC export model carries different attributes as detailed below.
(Image courtesy : Solibri_Wordpress )