Reference Attachment Settings - Scale accuracy problem

When attaching a file and trying to apply a scale factor to greater than 6 digit precision in the Attachment Settings dialog it rounds the value.

But if you go ahead and attach the file and then apply the greater than 6 digit precision value in the Reference Manager dialog.  It honors this greater value even though it shows the number to get rounded just the same as in the attachment dialog.

Is there a variable that controls attachment precision accuracy?  This seems to me to be a real flaw in referencing files.

FYI this is for attaching a file with grid or surface scale factor applied to it.

Thanks for any input on this topic.

Microstation V8i S4

and a Texan if this helps