Shipping type (VSART) not updated by DELVRY02 Idoc

Hello,

maybe someone can help me.

I'm receiving an DELVRY02 idoc for an outbound delivery. This idoc contains the shipping type in segment E1EDL28-VSART with value 01.

But, while processing this idoc, the field LIKP-VSART is not changed by the idoc. When I try it manually, it works.

Has somebody experience regarding this? I already read the idoc manual in WE60. Everything seems to be ok, but it doesn't work.

Thanks

Chris