Since Appian is case sensitive.
So my requirement is if I select a user "Radha" then it gets created but again if someone tries to create a username in lowercase"radha" then it should not get created.
Do suggest how to check it.
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How do you plan to create users? In admin console you can not check that. Using a process it should be simple to just validate against existing users and might need a combination of OOTB functions and plugins. If you do that through LDAP or SSO this is managed elsewhere.
Thanks..have created a PM from where am creating new user..