Currently Being ModeratedMar 17, 2013 6:22 AM (in response to jakudo)
I don't know of any way to do this, but perhaps the people who make ArchiCAD have some advice. By now they should have made their app conform to the Unicode standard like everyone else did a long time ago.
Are you using the Czech input keyboard provided by Apple? Are you using a standard Apple font like Lucida Grande? If you are using a non-apple font, try the latter and see what happens.