cannot create source system in RSA1

Hi,

I have a BI System:

Netweaver 7.0 unicode

BI_CONT 7.03

Windows 2003 server

SAP_BASIS: 700_016

SAP_BW: 700_18

I have an ECC 6.0 system:

Netweaver 7.0 non-unicode

Windows 2003 server

SAP_BASIS: 700_015

I go into RSA1 on my BI system

Click on Source Sytems

right-click on SAP and choose Create

I then fill-in the necessary ionformation and click on the Green check.

I am asked to login as an admin user.

I receive a popup sating that user already exist in source system, I choose Continue.

I receive a popup saying RFC destination already exists in source system. I choose USE.

I get this error at this stage: Error in source system JCB275.

So, I check RFC conenctions, they all work fine.

I finally find an error in SM21 in my ECC 6.0 system:

Run-time error "DYNPRO_SEND_IN_BACKGROUND" occurred

short dump generated.

So, I go into ST22 and try to get more info on the short dump (I only copy/pasted some info):

Runtime Errors         DYNPRO_SEND_IN_BACKGROUND
Date and Time          06.02.2009 09:56:18

The current ABAP program "SAPLSTRD" had to be terminated because it has
come across a statement that unfortunately cannot be executed.

During background processing, the system attempted to send a
screen to a user.
Current screen: "SAPLSTRD " 0351.

If the error occures in a non-modified SAP program, you may be able to
find an interim solution in an SAP Note.
If you have access to SAP Notes, carry out a search with the following
keywords:

"DYNPRO_SEND_IN_BACKGROUND" " "
"SAPLSTRD" or " "
"SYSTEM-EXIT"

Client.............. 700
User................ "BRUNEERI"
Transaction......... "RSA1"
Call Program........."SAPLRSAC"
Function Module..... "RSAP_BIW_CONNECT"
Call Destination.... "JCB275"
Source Server....... "svr60dbw_DBI_11"
Source IP Address... "10.16.33.3"

I search SDN and SAP notes to no avail.

Note that this ECC 6.0 system is also connected to another BI system and it works fine on that other system.

thanks to all