Exporting sheetmetal DXF as single entity

Hello,

I have an issue here when exporting the flat state of Sheetmetal parts. DXF will be created from the drawing.

We have checked off the splines option in the export menu.

In most cases the splines (end points) in the exported DXF file are not connected. Our supplier needs to connect the end points by themselves.

When I change splines to polylines, the end points are connected but the geometry contains only straight lines, we don't want this as well.

Are there any settings we have to use to solve this issue