Hi Andre,
Easiest as per Ludwin's response is to prefix the weekday with the day number. That obviously requires the end-users to accept this:
1.Montag 2.Dienstag 3.Midwok
Another alternative is to not have it dynamic and do a bunch of Modifies after retrieval:
In development you would need a result set with all the weekdays. You can name them in the dw editor. Then you need to destroy the days you don't want to show:
dw_xm.Modify ( 'Destroy wochentag_3' )
dw_xm.Modify ( 'Destroy wochentag_t_3' )
HTH
Lars