Symmetrical Part View Shows Solid Line Boundary

I have created a view of a symmetrical part, by cropping.  Yet the boundary of the crop (i.e. the line of symmetry) shows a solid line (see attached).

If via the document properties I change the detail view border to a "blank line", the view would be as desired, but any other detail views would adopt the same setting and then not be to the standard.

Does anybody know of a way to hide the solid line, or override individual detail views?  Or do it another way?

Thank you,

Janek

SW 2014

SolidworksDrawings And Detailing