Unvalid extensions / Ungültige Erweiterungen while zooming to BIM elements

Peter2
Peter2
in BricsCAD BIM

I exported the Revit-Architecture-Sample to IFC and played around in Bricscad Platinum. In structure-explorer I use the "BIM"-cst. The "Zoom to selected object" works fine, but on some elements - e.g. the windows in the "Roof Line" which are a block-reference, I get the message "Ungültige Erweiterungen (Invalid Extensions)".

Where does it come from?
What to do against it?

Regards

Peter

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