how to call portal from R3

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Hello Gurus,

I have a new requirement to call portal from r3. Its regarding KM. When ever a end user is using R3 Tcode, he will get a button of online user manual about that perticular T-code,,when he clicks on that button ,,he is directed to portal and the PDF of that Tcode opens..

Now the problem is that,,,,we have maintained SSO,,,it works fine when i login to portal and get the R3 screen,,,,but in reverse way,,,i.e when user calls portal from R3 for manual,,,it asks for password ,,,i don;t know where the problem lies,,,

We have already pass R3 certificate to portal and portal certificate to R3,,,also maintained profile paramenters,,,,also checked by creating transaction iview,,it works fine from portal to r3 but it is asking password when we go the reverse way ,,,.i.e from r3 to portal,,,,,kindly help,,,,,