APM SAML IdP does not automatically redirect to SP and stays on webtop

I cannot remember how many times I read this manual before :). So I re-read it carefully and found the trick that made the difference : the last line specifying the SSO URI (/saml/idp/profile/redirectorpost/sso) which one must not forget if one does not use a metadata exported file. This is working fine now. I now have to refine my understanding of all that to make it work for multiple SP :) Thanks for your help, both.