Need to make an rfc connection to R/3 side.

Hi BW experts,
I have an urgent requirement to display data from R/3 system at BW side based on the report value. We were doing RRI call to an ABAP report from a query at BW-side where parameters are passed to same ABAP report on R/3 side.
For this solution, the user should have an access to the R/3 system in order to Jump to the ABAP report. We want to avoid this.
So now the requirement is, user should be able to fetch the data from R/3 for display based on the ABAP report (developed in R/3) without actually logging in the R/3 system.
Can you provide me with some hints on this? This can be done using RFC connection Call but it is again asking for user id and password.
Regards,
Vipul Goyal

Hi Walter,
i had already done this part.
now i had created the abap report in bw-system itself and from there i am calling the remote function module by passing required parametes.
But problem is that it is still asking for username and password whlile login to the R/3 system.
Regarding the trusted/trusting relatonship i dont have access for that.
Can u tell me how this process is followed in extractors as  no username and password is asked during extraction process?
and can i follow the same process in this abap program.
and last how to create that special user which you have told in your first reply.

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