RFC Destination from CE is unwantedly using SSO

Hi,
Our developers are testing some services from Service Browser in CE 7.11 system. They are using the RFC Destination SAP_ECC which we have created from NWA --> Configuration Management --> Security --> Destinations.
In this RFC, we have given the details of the backend ECC system and also selected the user type as "Technical User" and provided a user/password. Pinging the destination from here works just fine.
But, when one of our services from Service Browser calls this destination SAP_ECC to access the backend system, then the call is not connecting to the backend using the technical user supplied in the destination, but is trying to use SSO. Thus the user being passed is not the technical user but the user of the developer who is calling the service. The error message says:
This system rejects all logons using SSO tickets
We do not have any intention of using SSO here.
Can someone suggest how to figure out why SSO is coming into picture and what can we do to elimincate this issue?
Thanks,
Shitij

set the sso parameters in the backend.

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<<Text removed>>
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RFC Destination from CE is unwantedly using SSO

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