Well yes, that is what I meant...you cannot save a 3D model file to DWG from Solid Edge "directly"...you need to use a neutral format, such as ACIS [.SAT] file, etc.
There is also, this 3rd party app [Add-In].... http://www.sycode.com/products/dwg_export_se/
Design Manager Streetscape Ltd
Solid Edge ST10 [MP2] Classic [x2 seats]
Windows 10 - Quadro P2000
In solid edge you need to use "save as translated" and choose .sat format.
In AutoCAD you need to use the command "import".