How to export mapping layers with a custom layer to DWG

Hi Solidworks forums,

I have created and detailed a Solidworks part drawing. I have then created a custom 'part' layer and placed my part on this layer.

I then go save the drawing as a .dwg file with the option "Don't show mapping on each save" box unchecked - This then allows the Solidworks to DWG Mapping box to open and allow me to custom name my dimension, title block, hatching etc, layers.

The issue is when I untick the "Only map entities that are not on SolidWorks layers", it disregards my part layer in the .dwg export. On the contrary when I tick the option, the mapped entities do not behave as I assign, but my part layer is correctly exported.

My question is how do I save the .dwg file with my custom mapped entities whilst including the custom part layer I assigned the part to?

I will need to apply this process to large assemblies.

Thanks for the help.

SolidworksDrawings And Detailing