Holes in part not getting converted to DXF

Hello,

How to make holes visible in DXF ?

I am trying to get a part ready for CNC routing.

The part has a hole touching the edge of a wall. When I try to convert to dxf these holes do not get converted. I tried saving as dwg as well but it does not work.

I have attached pictures for better understanding

using SW2015

Thanks !

SolidworksModeling And Assemblies