Capture Ctrl + Key in Qt

This is my scenario: A MainWindow with a single central widget that is a QTabWidget , plus its QToolBar . Each time I open a new document, an instance of a class that contains two QTabWidget and% QTableView is inserted within QTextEdit . The QTableView have a filter of events that cause them to react in a special way to certain function keys, and that works perfectly. However, when I press keys like Ctrl+C , Ctrl+V or Ctrl+X I get an error type:

  

QAction :: eventFilter: Ambiguous shortcut overload: Ctrl + V *

Within the QToolBar I have defined those actions (Copy, Paste and Cut), with their buttons and keyboard shortcuts.

For the error of Ambiguous shortcut overload set shortcutContext to WidgetWithChildrenShorCut , in each of these actions.

The problem is that I am not able to capture the key combination Ctrl+Tecla , or at least nothing happens when I do it.

This is an excerpt from the event filter:

bool Filter::eventFilter(QObject *obj, QEvent* event)
{
    qDebug()<<obj->objectName();
    TablaBase* table = qobject_cast<TablaBase*>(obj);
    if( !table )
    {
        return QObject::eventFilter(obj, event);;
    }    
    if (event->type() == QEvent::KeyPress)
    {
        QModelIndex indice = table->currentIndex();
        QKeyEvent *ke =static_cast<QKeyEvent*>(event);
        if (ke->matches(QKeySequence::Copy))//primer intento de capturar!!!
        {
            qDebug()<<"Copiando 1";
            return true;
        }       
        switch (ke->key())
        {
        //segundo intento!!!!
        case(Qt::Key_C):// && (ke->modifiers().testFlag(Qt::ControlModifier))):
        {
            if (ke->modifiers()==Qt::ControlModifier)
            {
                qDebug()<<"Copiando 2";
                return true;
                break;
            }
        }
        default:
        {
            return false;
            break;
        }
        }
    }
    return QObject::eventFilter(obj, event);
}