@Joel, thanks fotr the tip but unfortunatey it wasnt. enough...
while creating an alternative layout i get the message: Cannot create a mapped style when one of the source styles is based on another source style.
thats why i cleaned up all the based on styles.
I found another link which told me to cleanup nested styles. so i used the script: ApplyNestedStyles.
Still it didn't work.
I edited all the exportlabels of the paragraph and charcterstyles. Still no result but still the sam message...
anybody?