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i am getting this message
You do not have access to this area. Contact your site administrator to obtain access.

when i am login with regular user .when i am accessing custom module then this message display so how to access custom modules with regular user

Have you tried this?

https://www.suitecrm.com/forum/suitecrm-7-0-discussion/5426-probem-to-access-in-my-custom-module