Hi,
Method:1
After create the back RFC in the managed system, in solman -> Environment -> solution maanager operation -> Adminstration SDCCN -> active the managed system( it will set the back rfc in managed system for Session Data')
Method:2
Goto managed system SDCCN -> Goto ->settinds-> task specific ->Rfc destination -> click the setting box -> edit the Rfc destination -> add the back rcf in the screen and continue the configuartion
http://scn.sap.com/docs/DOC-45842,
remaining step same in 7.01 EHP version -https://websmp208.sap-ag.de/~sapidb/011000358700001873212008E
Rg,
karthik