Revit Material Definition

I've received files exported from Revit to DWG - to be included in a Microstation model.

They all have long lists of RevitMaterialDefinitions as shown below. As far as I can tell, they're neither attached nor assigned to any geometry in the files, so I'd like to remove them.

If I select them all and hit delete, Microstation crashes.

It takes several minutes to delete each one at a time (there are hundreds).

Does anyone know how to remove them all at once?

I've tried going back and forth between DGN and DWG, with no luck.



Connect -

v8i -

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