Export only visible lines

[Anonymous]

I have a table with chairs but when export in dwg i cant see the table correctly
I see the chairs lines under it !
Is a simple problem for A12 but i can not solve.I need export only visible lines
and i cant found this simple option!
Thankfully in advance for any help.

But if export as pdf all is fine!!!!!!!!!!!!!!
Wichs the dwg export problem?