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I am using EF4 with WCF and POCO. I removed all virtual keyword in POCO entities. I have Employee and Team entities and relationship between both is 1:N, means that one employee can be allocated only one team. And I'd like to add new employee with existing team. Following code is in the client side. private void btnAdd_Click(object sender, RoutedEventArgs e) { Team teamFromDb = ServiceProxy.GetService.GetTeamById(181); Employee newEmp = new Employee{ UserName="username"}; newEmp.Team = teamFromDb; ServiceProxy.GetService.AddEmployee(newEmp); } Following code is in the server side (Dao layer) public void AddEmployee(Employee emp) { ctx.Employees.AddObject(emp); } public Team GetTeamById(int teamId) { return ctx.Teams.Where(t => t.TeamId == teamId).FirstOrDefault(); } Problem is that I got "Collection was of a fixed size" Exception when I add teamFromDb instance to the newEmp.Team property in the client code. Do I need to add some more code to fix? In addition, What do I need to for Insert/Update/Delete job with POCO classes and WCF Thanks in advance.

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