idp.logout.authenticated setting but limited to a single SP

[Francesco Malvezzi]

hi everybody,

I have met a SP whose SLO only works if I set the global IdP parameter:

idp.logout.authenticated = false

May I ask if anyone could share the relying-party.xml override snippet 
that would allow the IdP accepts unauthenticated logouts only from a 
single SP? Or nudges me to the right direction?

thank you for your time,

Francesco