Storing OAM request headers in OAM Session

Hi,

Using OAM R2PS3, as part of the OAM Authorization policy responses, I want to store request header variables as session variables to use later to enforce a certain sequence of URL access.

There are multiple uses of doing this.  But I cannot seem to be able to do this. The only name space I can use are request, user and session.

Has anyone cracked this ?

Thank you

Narsimha