Hi LyXers, it's a bug: the layout-skript of LyX is wrong. There ist anywhere - I just don't remember where - an "e" which doesn't to be there. Since I fixed it for my own changing the former code I do not know where it was. I guess it was in the second line: change "scrlettr" into "scrlttr2" and it should work. If it doesn't just let me know. If it works tell it to the list - just to have it fixed furthermore. Sorry, I forgot to mail the bug when I found it.
Micha-E.