Problem sending IDOC DESADV /AFS/DELVRY03 to XI

Hi Gurus,

I have problems sending IDOCs DESADV (basic type /AFS/DELVRY03) created by function LSEND_IDOC to XI system. IDOC is correctly created by R3 system (AFS ECC 5.0) and correctly sent on the XI port (Status: Data passed to port OK - 03), but XI system doesn't receive IDOC.

If I resend the same IDOC by WE19 tcode goes ok!!

In R3 sending system nothing warnings/errors in syslog or sm58.

Any suggests? Thanks in advance.