problems and missing options with the stl export feature

Hi,

i am running (GER) NX11 on Windows 7 and need to export some Files to stl.

in the Menu i miss some Options i would only get when i select sheet bodies for export.

https://docs.plm.automation.siemens.com/tdoc/nx/11.0.2/nx_help/#goto:rapidprototyping:xid1205322

Where can i find the tickbox sheet bodies for export to get those Options?

When i try to export it to stl i always get the error "negative koordinates found"

anybody knows how to fix this?