Hm, it looks like that segment should've worked...
WHEN 'E1EDT13'. S_DT13 = IDOC_DATA-SDATA. CASE S_DT13-QUALF. WHEN '006'.<...> MV S_DT13-ISDD S_KOKO-WADAT_IST.
Did you put the date in the right field (ISDD) and did you try debugging this?
Hm, it looks like that segment should've worked...
WHEN 'E1EDT13'. S_DT13 = IDOC_DATA-SDATA. CASE S_DT13-QUALF. WHEN '006'.<...> MV S_DT13-ISDD S_KOKO-WADAT_IST.
Did you put the date in the right field (ISDD) and did you try debugging this?