Problems when trying to connect BW to R/3

hello all,
i am new to SAP and am trying to connect my BW3.0 with R/3 4.6c which are on two different laptops. have created a logical source system on R/3 side and assigned it there successfully. have also created a logical system on BW side but when trying to assign it, i am getting an error 'be careful when trying to change the source systems'. have accepted it and after that i cannot go into RSA1- comes up with a message saying 'logical system has been changed'.
when i go into details of this error message, it will ask me to delete all the transfer structures/rules created earlier and shouldnt be using ALE or work-flow.
how can i assign the newly created logical system in BW???
thanks in advance...
sujan

hello naveen,
i will try to explain it again....
i have already got a source system by name BWINST in my BW system and i have created another logical source system just for the purpose of communicating with my R/3 system. when i tried to assign this new logical system, i get a warning message saying "Be careful when changing your logical system". i have OK'd it and was trying to get into RSA1. I now get an error message saying "Your logical system has been changed and your request will be terminated" and will close the application. It also says that if i need to change my source system to my new one i will have to delete all my transfer structures, and shouldnt be using any ALE or workflow and ....etc. I cannot even get into AWB now but when i change my source system back to BWINST everything works fine.
so can i use my first source system for communicating with my R/3 system...
hope this is clear...
thanks for trying to help me...
sujan

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