OAM-OIM 11.1.1.5 Integration - Not able to login to OIM after the integration

Following the steps in the integration documentation , integration of OAM-OIM 11.1.1.5 was completed. After the integration as part of integration testing created a new user and trying to login as that newly created user into OIM but the login attempt is failing.

 Here is how to solve it

 Upon looking at the OAM server log you can see the error like this 

<Apr 11, 2012 1:42:09 PM PDT> <Error> <oracle.oam.user.identity.provider> <OAMSS
A-20023> <Authentication Failure for user : akini.>
<Apr 11, 2012 1:42:09 PM PDT> <Error> <oracle.oam.user.identity.provider> <OAMSS
A-20011> <User not found : akini : No User found matching the criteria.>

This is due to the fact that OAM is not searching the user using uid rather it uses cn. 

Login to OAM console . Click on System Configuration -> Data Sources -> OIMIDStore and Open this data source. 

Change the User Name Attribute from cn to uid

Now try to login again into OIM as the newly created user. You should be able to login.