Problems with priviledge set using Filemaker 11 Pro

[ceste]

Hi all, I'm new in this forum and I'm using for the first time FM.

I have 4 tables (User, Projects, Tasks & BusinessUnit) and two types of users (Admin & user). BU is in relation with Projects and with User. Projects is in relation with Tasks (a project is divided into tasks).

One or more users are assignment to a BU and every BU has one or more projects assigned.

A user can see only the project where he's assigned and I'm using, in Priviledge Set under Security section, "User::username=Get(AccountName)" in Project. In this way I can see only the projects where the user is the only assigned! But a project is divided into tasks and a user may have only one task per project (!).

Anyone can help me? Possibly without scripts, only workin' in Security section.

I'm sorry if my english is not so good.

Thanks and have a nice day!

[comment]

a user may have only one task per project (!).

Not sure what your question is. Are there other tasks, assigned to other users? If so, what should each user be allowed to see?