dojo.data.ItemFileWriteStore: Invalid item argument in dijit.tree

http://stackoverflow.com/questions/14855318/dojo-data-itemfilewritestore-invalid-item-argument-in-dijit-tree#14855318

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/dojo/1.8.1/dijit/themes/claro/claro.css">

JavaScript

require(["dojo/data/ItemFileWriteStore"], function(IFWStore) {
 
    var store = new IFWStore({
        data:{
            "identifier":"id",
            "label":"name",
            "items":[
                {"type":"parent","name":"Adresse des Finanzamts","id":"1020right00","children":[
                    {"type":"Leaf","name":"Relationship type: 1:1","id":"Adresse des Finanzamts1:1"},
                    {"type":"parent","name":"Left","id":"Adresse des Finanzamts010","children":[             
                        {"type":"Leaf","name":"Table name: Finanzamtdaten","id":"1014left23432"},
                        {"type":"Leaf","name":"Field name: fkFinanzamtAdresse:INTEGER","id":"1018lef423t"}
                    ]},
                    {"type":"parent","name":"Right","id":"Adresse des Finanzamts111","children":[
                        {"type":"Leaf","name":"Table name: Adresse","id":"1077right234"},
                        {"type":"Leaf","name":"Field name: adresseId:INTEGER","id":"10666right2223"}
                    ]}
                ]},
                {"type":"parent","name":"Adresse des Mitarbeiters","id":"1013right00","children":[
                    {"type":"Leaf","name":"Relationship type: 1:1","id":"Adresse des Mitarbeiters1:1"},
                    {"type":"parent","name":"Left","id":"Adresse des Mitarbeiters010","children":[
                        {"type":"Leaf","name":"Table name: Mitarbeiter","id":"100left23432"},
                        {"type":"Leaf","name":"Field name: fkAdresse:INTEGER","id":"1012lef423t"}
                    ]},
                    {"type":"parent","name":"Right","id":"Adresse des Mitarbeiters111","children":[
                        {"type":"Leaf","name":"Table name: Adresse","id":"105right234"},
                        {"type":"Leaf","name":"Field name: adresseId:INTEGER","id":"106right2223"}
                    ]}
                ]}
            ]}
    });
    console.dir(store);
    
    store.fetch({
        query: {...