I have a metric file with working units of m, mm, 100, 80. I'm attaching a border as a reference and attempting to scale it up to 800:1, but it won't allow me to do it. The maximum scale it will accept is 500:1. Is there a limitation?
In J, if you attach a reference file without using a saved view, it can require a clip boundary before moving and scaling. When attached as a saved view, the view limits act like a pre-clipped reference file.