Picker with Fetchrequest

Question

I have some trouble with pickers with Fetchrequest. I can display a list but can't manage the picker.

struct DepenseView: View {
    
    @Environment(\.managedObjectContext) var moc
    @FetchRequest(sortDescriptors: []) var TypeDepenses: FetchedResults<TypeDepense>
    @State var selectedDepense : String = "Autre"
       
    var body: some View {
        List {
                ForEach(TypeDepenses) { typb in
                    Text(typb.type ?? "Unknown Title")
                }
        }
            
        List {
            Picker("Type", selection: $selectedDepense){
                ForEach(TypeDepenses){ type in
                    Text(type.type ?? "Unknown Title").tag(type.type)
                }
                Text("Autre").tag("Autre")
            }
        }
    }
}            

I tried to add .tag with different possibilities (.tag(type), .tag(type.type), .tag(type.id), ...). I just want the picker list to be different type from the data base. I can see them but I can't select them.