Viewport boundary being shown in Xref - how to switch this off??

Its very simple. We have a certain drawing that when we xref in dwg's is also brings in all the viewport boundaries. It has nothing to do with layers or line types etc. The view ports in model space dont print either it just making the drawing difficult to use.

I know there is a command to switch this off. So far we have spent an hour googling it. Can anyone help out.

Cheers

Keps

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