Portal Access to another Apm provided page

Hi

I'm trying to add a portal access on an existing APM policy. The target web page provided with APM and located on another F5 which belongs to someone else. I mean there is a credential form provided by APM which i have to use sso on remote apm. I've never done this before. Is that possible to serve another APM web page with APM ?

I did not tried yet, but i believe that sessions or MRH cookies is going to break something.