XI 2.0 problem: scenario xml -> xi -> idoc

Hi!

my scenario is xml -> xi -> idoc1, idoc2.

when the interface start, if I call SXMB_MONI I see that idoc1 is correct; for idoc2 the system generate an error: idoc.adapter.generic, "MSGGUID 587E007DA385D54697B3F02220A78987: Tag ORDERHEADER found instead of tag IDOC BEGIN=.</"

Can you help me to undestand the problem?

10 points for you!

Thanks,

Gianluca