oam 11.1.2.2 SAML GLOBAL LOGOUT- relogin with different user gives error

Hi,

We have integrated a application by federation(SAML) based. OAM is 11.1.2.2. The Issue is :

1. User access the IDP inititated URL, gets OAM login page and provides credentials.

2. User is taken to the hope page of the application. And then he clicks logout.

3. On logout, he is redirected to OAM login page and there if the same user gives his credentials again, it logs him into the application.

But the issue is, at step 3#, if the user gives a different credential(of user , it gives him a system error page of OAM. And this is consistent.

On debugging i notice that , if in my browser when i explicitly kill the federation cookies and OAM cookies and then re login with different user works.