submitAll fail if it is send from a QAction but not from a QPushButton

class MainWindow : public QMainWindow {
    Q_OBJECT

    QSqlTableModel* modelDossiers;
    QDataWidgetMapper *mapper;
public:
    MainWindow(QWidget *parent = 0);
    ~MainWindow();
private slots:
    void on_pushButton_clicked();
private:
    Ui::MainWindow *ui;
};

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    QSqlDatabase m_dbSQLite = QSqlDatabase::addDatabase("QSQLITE");
    m_dbSQLite.setDatabaseName("c:/Dev/Bels2/Bels2/Datas/Bels.sqlite");
    if(m_dbSQLite.open())
    {
        modelDossiers = new QSqlTableModel ();
        modelDossiers->setTable("Patients");
        modelDossiers->setFilter(QString("ID = %1").arg(3742));
        modelDossiers->setEditStrategy(QSqlTableModel::OnManualSubmit);
        modelDossiers->select();

        mapper = new QDataWidgetMapper ();

        mapper->setSubmitPolicy(QDataWidgetMapper::AutoSubmit);
        mapper->setModel(modelDossiers);
        mapper->addMapping(ui->lineEdit, modelDossiers->fieldIndex("Name"));
        mapper->toFirst();

        ui->mainToolBar->addAction(tr("Valid"), this, SLOT(on_pushButton_clicked()));
     }

}

void MainWindow::on_pushButton_clicked()
{
    if(modelDossiers->submitAll())
        qDebug () << "Submit";
}