RFC_SYS_EXCEPTION RFC_IO27

Question

Hello,
I call via RFC a FB in SAP named Z_ITESOFT_ARCHIV02 with some export parameters, the FB itself works correct but I get allways an exception back:
  25.07.105  18:40:22.115 *** Calling  RFC Function 'Z_ITESOFT_ARCHIV02'
  25.07.105  18:40:22.161 RFC CALL status = RFC_SYS_EXCEPTION
  25.07.105  18:40:22.161 RFC Error: RFC_IO27
  -Status:CODE=CM_DEALLOCATED_NORMAL STATUS=CM_NO_STATUS_RECEIVED DATA=CM_COMPLETE_DATA_RECEIVED ID=28645066
  -Message:connection closed
  -Internal Status:IO HANDLE=1 DRV=EXT LINE=1400 CODE=27 : GET ID=ffff LINE=846 CODE=7
  25.07.105  18:40:22.161 Function call finished.
FMFOSapRfc;25.07.05;18:40:22;[Info   ];ITESOFT;FMFOSapRfc.iCON:LinkBarcode;Func.Call failed: 3 | 'SYSTEM_FAILURE'
here the code snippet in VB:
    Set Func = SapFuncs.Add(strFuncLinkBcd)
    Func.Exports("IDOCNUM") = strDocnum
    Func.Exports("BCODE") = strBarcode
    Func.Exports("LOG_SYSTEM") = ""
    Func.Exports("CLASSNAME") = strClassname   ' from ini file
    Func.Exports("CLASSTYPE") = strClasstype   ' from ini file
    Func.Exports("CONTREP") = strContrep       ' from ini file
    Func.Exports("DOCUTYPE") = strDocutype     ' from ini file
    Func.Exports("BDSBARCOM") = strBdsbarcom   ' from ini file
    CallOk = Func.Call
    SapRet = Func.ReturnCode
Any ideas why I get allways this error?
Enrico

Answer 1

this function was implemented by a business partner, the function itself in SAP works correctly, calling from outside too! so you mean this functions raises an exception after done the work? As I get this exception on two SAP systems maybe it could be the function or it can be the tools I use for the rfc functionality. But in view of the error messages you can not say closer what can be wrong?