1) Remove "Complete" action button on AR Transactions for few user on the basis of assigned Roles
2) Provide access to few users to "complete" action for AR Transactions .
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I have used below Edit Page component through Sandbox >>EL but "Complete" Button is getting disabled for all users
#{securityContext.userInRole['AZM_LOG_COM_ACTION']}
AZM_LOG_COM_ACTION - this is dummy role assigned to 2 users only.