RFC Call through BSP - Issue with RFC logon credentials

Hi everyone,
I have an BSP application running on a 6.40 which calls a RFC function module on a backend system (4.6c) using a trusted RFC connection.
The BSP is started with an URL which contains in encoded form the username and password. So we don't use the standard sap-username & sap-password.
In the first step the user is logged in with the anonym user (user type 'service') which is entered in the SICF. So sy-uname = 'anonym'.
After a couple of checks and verifications the BSP makes a user switch using 'SUSR_INTERNET_USERSWITCH'. Exporting parameters are the now decoded values from the URL. So after the switch sy-uname is e.g. 'blabla'.
Now a function module on the backend system is called. What I would now expect is that on the backend system sy-uname is also 'blabla'. But it isn't. The sy-uname is still 'anonym', which isn't very helpful regarding object authority checks.
Only after an reload of the BSP page and a second RFC call of the function module the sy-uname = 'blabla'.
I wonder what causes this problem?
Thanks for your replies & regards
Kruno

Hi,
I solved it.
Before I execute function 'SUSR_INTERNET_USERSWITCH' I first check if user has a valid backend account by using function module 'BAPI_USER_EXISTENCE_CHECK'.
And this is the problem. When 'BAPI_USER_EXISTENCE_CHECK' is executed once all other RFC function calls to the backend get the wrong user.
Why? I don't know yet. Maybe I will get an useful anwer from an OSS note.

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RFC Call through BSP

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Hi Divyanshu
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REASON = strreason
CASHADVANCE = strcashadvance
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BANKADVANCE = strbankadvance
BANKCURR = 'INR'
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REINR = watripno
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MESSTAB =
ADDDEST = adddest
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Naresh

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key: ERROR UPDATE
message: EXCEPTION UPDATE_ERROR RAISED
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This trouble ticket was created by SAPup on 20111125120155
SAPup broke during phase CREATE_UPGEVAL in module MAIN_POSTP / Post Processing
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Summary of SAPup:
SAPehpi Release:        lmt_002
SAPehpi Version:        SAPup release lmt_002 version 41.001
Start Release:          701
Target Release:         730
Summary of host system details:
SID:                    TA1
Host:                   sapta1
MS Host:                sapta1
GW Host:                sapta1
Start Path:             /usr/sap/TA1/DVEBMGS02/exe
Kernel Path:            /usr/sap/TA1/DVEBMGS02/exe
Summary of operating system details:
OS Type:                Linux X86_64
OS Version:             2.5
Summary of database details:
Database Type:          ora
Database Version:       11.2.0.2.0
Summary of RFC details:
Host:                   sapta1
GW Host:                sapta1
Client:                 000
Destination:            TA1
Language:
System No.:             02
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1 ETQ201 Entering upgrade-phase "CREATE_UPGEVAL" ("20111125120352")
4 ETQ399 Set environment for standard connect:
2 ETQ367 Connect variables are set for standard instance access
4 ETQ399 System-nr = '02', GwService = 'sapgw02'
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4 ETQ399   auth_shadow_upgrade=0
1 ETQ200 Executing actual phase 'MAIN_POSTP/CREATE_UPGEVAL'.
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Here is the dev_rd log:
Fri Nov 25 14:07:04 2011
***LOG S23=> GwIDisconnectClient, client disconnected (020) [gwxxrd.c     10423]
***LOG S74=> GwIDisconnectClient, client disconnected ( sapta1) [gwxxrd.c     10434]
***LOG S0R=> GwIDisconnectClient, client disconnected () [gwxxrd.c     10451]
***LOG S0I=> GwIDisconnectClient, client disconnected ( SAPCPIC) [gwxxrd.c     10464]
LOCATION    SAP-Gateway on host sapta1.sap.fr.alten.com / sapgw02
ERROR       connection to partner 'localhost.localdomain:0' broken
TIME        Fri Nov 25 14:07:04 2011
RELEASE     720
COMPONENT   NI (network interface)
VERSION     40
RC          -6
MODULE      nixxi.cpp
LINE        4850
DETAIL      NiIRead: 127.0.0.1:0
SYSTEM CALL recv
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Message was edited by: Vijaya Kumar

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Hi,
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RFC Call through BSP - Issue with RFC logon credentials

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