webix combo option not support the json data format.

I have one json file and I want to list all the json data into webix combo option.But it showing error.

My json format

[{
 "USER_ID": 103,
 "USER_NAME": "ABCD"
}, {
 "USER_ID": 104,
 "USER_NAME": "EFGH"
}, {
 "USER_ID": 105,
 "USER_NAME": "IJKL"
}]

my code of datatable is

this.dtable = new webix.ui({
                container: "box",
                view: "datatable",
                autoheight: true,
                autoConfig: true,
                css: "auditreview_style",
                id: "expList",
                editable: true,
                columns: [
                    { id: "status", header: "", width: 100, template: "{common.checkbox()}" },
                    { id: "Client", header: "Client/Code", width: 180, sort: "text" },
                    { id: "Code", header: "Carrier/Code", width: 180, sort: "text" },
                    { id: "Invoices", header: "Invoices", width: 180, sort: "text" },
                    { id: "Shipments", header: "Shipments", width: 180, sort: "text" },
                    { id: "Audits", header: "Potential Audits", width: 180, sort: "text" },
                    { id: "Manual", header: "Manual Audit", width: 180, sort: "text" },
                    { id: "DeadlineDate", view: "button", header: "Audit Deadline Date", fillspace: true, width: 180, sort: "text", editor: "editdate", editable: true },
                    {
                        id: "Assignee", label: "TRIPATHI", header: "Assignee", fillspace: true, width: 180, sort: "text", editor: "combo",
                        options: this.auditorslists, suggest: {
                            template: '#value#',
                            filter: function (item, value) {
                                if (item.value.toString().toLowerCase().indexOf(value.toLowerCase()) === 0)
                                    return true;
                                return false;
                            },
                            body: {
                                template: '#value#',
                                yCount: 7,
                                on: {
                                    'onItemClick': function (id) {
                                        console.log("Webix datatable called");
                                    }
                                }
                            }
                        }
                    }
                ],
                data: this.items
                //url: '../assets/data-json/datalist.json'
            });

Here is the snippet.

I have a snippet at which I get JSON data into combo option drop down.But once I select data from option then it is not showing selected data.

Please help me I have a problem with snippet below.

http://webix.com/snippet/ca8b1b00