To manage AFP server through the AFP iManager plug-in, ensure that the admin user or the container admin user is LUM-enabled. For more information, refer to Using Novell iManager for Linux User Management in the OES 2015 SP1: Linux User Management Administration Guide.
The install administrator must have Compare, Read, Write on ACL Attribute to add the Common Proxy user as a trustee of AFP user contexts selected at the time of installation.