exporting windowframe from Revit to IFC

[heiminge]

Hello

I have a problem with windowframes exporting from Revit to IFC. As you can see in the attachment the frame is a family. When exported to IFC the frame becomes lose parts (shown in Solibri)…

is there somewhere a setting in IFC where this can be prevented?

Thanks in advance!

[ToanDN]

Because the window is built from shared nested families?

[heiminge]

Yes its a family containing nested families