[TYPO3-ttnews] How to get data onti subheader/short using ttnews_rss_import

[Hartmut Steglich]

Hello list,

using  ttnews_rss_import i can succesfully import feed data into the 
corresponding tt_news fields for author, date, bodytext ...

How can I import the description from the feed item into short/subheader 
of a tt_news?
Already tried this in the field mapping:
short = description
subheader = description
even short = content:encoded does not work

Thanks,
Hartmut