After integrating the LDAP with the EM, user is able to login to the EM with user <user A> but unable to view any modules.
Checked the configuration files realms.xml, domains.xml, server.xml and the user "<user A>" has been assigned to full permission.
User was able to see the modules before when he was using the local admin user, but after integrating the LDAP with the EM, he is unable to see the modules.
Issue is resolved after adjusting the following parameters in realms.xml:
<property name="userObjectQuery">
<value>(&(objectClass=organizationalPerson)(<user name X>={0}))</value>
</property>
<property name="usernameAttribute">
<value><user name X></value>
</property>
Also user achieved fast login by restricting the search in the LDAP tree:
<property name="baseDN">
<value>OU=<OU>,DC=system,DC=local</value>
</property>