Call transaction in abap server proxy

Hallo
We have a problem with one of our server proxys.
Scenario: SAP - backend system
The functionality implemented is the creation of a service notification
(IW51). The creation is made using batch input/call transaction and is
capsuled in an function module. In case of error by creation, the
message table will be read and a application error will be raise.
In the implementation of the proxy class the function module will be called
and the exceptions will be read and put in the response.
In case of success by the creation of the notification, everything is working ok.
In case of error in the call transaction, we will receive a "server
error" in XI, even if the error is catched and treated. In the trace we can see the error message from the call transaction, even if we do not send these messages in our response anymore.
<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
- 
- <SAP:Error xmlns:SAP="http://sap.com/xi/XI/Message/30" xmlns:SOAP="http://schemas.xmlsoap.org/soap/envelope/" SOAP:mustUnderstand="1">
<SAP:Category>XIServer</SAP:Category>
<SAP:Code area="INTERNAL">HTTP_RESP_STATUS_CODE_NOT_OK</SAP:Code>
<SAP:P1>500</SAP:P1>
<SAP:P2>Internal Server Error</SAP:P2>
<SAP:P3 />
<SAP:P4 />
<SAP:AdditionalText><html> <body> <H1> 500 SAP Internal Server Error </H1> Error message: Counter reading smaller than in previous document 10000009340 ( type of termination: ERROR_MESSAGE_STATE ) </body> </html></SAP:AdditionalText>
<SAP:ApplicationFaultMessage namespace="" />
<SAP:Stack>HTTP response contains status code 500 with the description Internal Server Error XML element Envelope missing in SOAP message header (SAP XI Extension)</SAP:Stack>
<SAP:Retry>N</SAP:Retry>
</SAP:Error>
Ex: if by call transaction we have at the end 2 messages ( first W and second E) , we will see in the tracing in XI the second message ( so the error one ).
In the backend system (SAP), under sxmb_moni the message in question has the status : "green flag".
We used the same way of implemenation for all our interfaces. The only difference is that we are now using a batch and not a bapi or SAP function module for objects creation.
Has someone any idea? . Any suggestion will be really helpful.
Thanks.
Anca

Hi Udo
My response has the following structure:
notification nr
+ 3 fields: message type (E,W,I,S,A)
            message nr
            message text
In case of error I should receive this filled structure and not a internal service error.
When I am testing the class in SAP is working very good.
Proxy Class implementation:
CALL FUNCTION 'Z_B2_CREATENOTIFICATION1'
EXPORTING
    P_SERNR              = i_sernr
    P_MATNR              = i_matnr
    P_CDGRP              = i_cdgrp
    P_CODE               = i_code
    P_KUNAG              = i_kunag
    P_DATE               = i_data
    P_COUNT              = i_counter
P_NTYPE              = 'Z7'
P_VKORG              = '2730'
P_VTWEG              = '20'
P_SPART              = '10'
P_PARVW              = 'AG'
P_NAME               =
    P_EMAIL              = i_email
IMPORTING
   E_QMNUM              = e_qmnum
   e_return             = e_error
TABLES
    T_SPARES             = t_spares
EXCEPTIONS
   EQUI_NOT_FOUND       = 1
   ERROR_EMAIL          = 2
   MEAS_POINT           = 3
   ERROR_NOTIF          = 4
   OTHERS               = 5
output-MT_CREATE_NOTIFICATION1RESPON-returncode = sy-subrc.
case SY-SUBRC.
when 1.
output-MT_CREATE_NOTIFICATION1RESPON-rctxt = 'equi'.
when 2.
output-MT_CREATE_NOTIFICATION1RESPON-rctxt = 'error email'.
when 3.
output-MT_CREATE_NOTIFICATION1RESPON-rctxt = 'meas point'.
when 4.
output-MT_CREATE_NOTIFICATION1RESPON-rctxt = 'notification'.
when 5.
data mess type ZB2_EXCHANGE_FAULT_DATA22.
      mess-fault_text = 'others'.
      raise exception type ZB2_CX_FM_CREATE_NOTIFICATION1
             exporting standard = mess.
endcase.
output-MT_CREATE_NOTIFICATION1RESPON-qmnum = e_qmnum.
data out_return type ZB2_DT_RETURN2.
IF e_error-type is not initial.
out_return-type = e_error-type.
out_return-number = e_error-number.
out_return-message = e_error-message.
append out_return to output-MT_CREATE_NOTIFICATION1RESPON-DT_RETURNS.
endif.
Regards,
Anca

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<link to blocked site removed by moderator>
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http://help.sap.com/saphelp_nw04s/helpdata/en/2d/b9766df88f4a24967dae38cb672fe1/frameset.htm
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