Transactions in Microsoft Access

[PinTxO]

Hi guys.

I have a database (.mdb) and I connect to it from my QT application. I do not have problems to read the data but when I save it, I want to do it through a transaction and I can not because I'm having an error. I paste how I open the connection and how I launch the transaction:

The connection:

m_db = QSqlDatabase::addDatabase("QODBC");
QString strPathDDBB="DRIVER={Microsoft Access Driver (*.mdb)};FIL={MS Access};DBQ=" + QCoreApplication::applicationDirPath() + "/galibo.mdb";
m_db.setDatabaseName(strPathDDBB);
if (!m_db.open()) {
    QMessageBox::critical(0, QObject::tr("Database Error"), m_db.lastError().text());
  }

m_db = QSqlDatabase::addDatabase("QODBC");
QString strPathDDBB="DRIVER={Microsoft Access Driver (*.mdb)};FIL={MS Access};DBQ=" + QCoreApplication::applicationDirPath() + "/galibo.mdb";
m_db.setDatabaseName(strPathDDBB);
if (!m_db.open()) {
    QMessageBox::critical(0, QObject::tr("Database Error"), m_db.lastError().text());
  }

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The transaction:

bool feature = m_db.driver()->hasFeature(QSqlDriver::Transactions);
if (!m_db.transaction())
{
    error = "An error occurred while creating the transaction in the database\n";
    error += m_db.lastError().text();
    return false;
}

bool feature = m_db.driver()->hasFeature(QSqlDriver::Transactions);
if (!m_db.transaction())
{
    error = "An error occurred while creating the transaction in the database\n";
    error += m_db.lastError().text();
    return false;
}

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The feature variable returns true and the text error is "[Microsoft] [Microsoft Access ODBC Driver] Unable to define attribute now QODBC3: Unable to disable autocommit"

Any ideas?