Value as Object when selecting item in Select2

The Select2 plugin works normally, the only problem is when I make the item selection the value set in the hidden (mandatory to bring data via AJAX) stays as [Object Value] and not the value specified by the format.

Follow form:

    <form id="Teste" method="get" action="">
        <input type="hidden" id="e6" name="e6" class="select2" style="width: 600px;" />

        <input type="submit" value="Enviar" />
    </form>

Value in input hidden after selection:

<input type="hidden" id="e6" name="e6" class="select2 select2-offscreen" style="width: 600px;" tabindex="-1" title="" value="[object Object]">

JavaScript to create Select2:

function formataResultado(item) {
    return item.Text;
}

function formataSelecao(item) {
    return item.Value;
}

$("#e6").select2({
    placeholder: "Selecionar fornecedor",
    minimumInputLength: 0,
    id: function(data){return {id: data.id};},
    allowClear: true,
    ajax: {
        url: "http://localhost:1396/Lista/_GetDropDownListFornecedor",
        dataType: 'jsonp',
        quietMillis: 300,
        data: function (term, page) {
            return {
                searchString: term,
                pageSize: 60,
                pageIndex: page,
            };
        },
        results: function (data, page) {
            return {results: data.results, more: (page * 60) < data.total };
        }
    },
    formatResult: formataResultado,
    formatSelection: formataSelecao,
    dropdownCssClass: "bigdrop",
    escapeMarkup: function (m) { return m; }
});

JSON returned by the AJAX query made by Select2:

{"results":[{"Selected":false,"Text":"Cezar Barbara","Value":"724"},
 {"Selected":false,"Text":"Cezar Barbara","Value":"765"}],
 "total":82}