Wierd behaviour of QSQLQuery

Hi,

I have a program that uses two QSQLQueries

Code:

QSqlQuery lktable(database);
    QSqlQuery atable(database);

Using them like this

Code:

sql = "SELECT SYS_COD,PLOT_COD,NUMSEASON,CROP_COD,ACTY_COD,FORA_COD FROM crpforamanfeed WHERE SYS_COD = 'KE20061129ILREMBMZCTB' AND LIVE_ICOD = '001'";
    if (lktable.exec(sql))
    {
        {
            while (lktable.next())
            {
                ...
                sql = "SELECT period_id,tim FROM crpforamanfeedperiods WHERE SYS_COD = 'KE20061129ILREMBMZCTB' AND PLOT_COD = '001' AND NUMSEASON = '01' AND CROP_COD = 'BX' AND ACTY_COD = '006' AND FORA_COD = '001' AND SYS_COD = 'KE20061129ILREMBMZCTB' AND LIVE_ICOD = '001'";
                if (atable.exec(sql))
                {
                    temp = 0;
                    while (atable.next());
                    {
                        if ((atable.value(0).toInt() >= 1) &&
                            (atable.value(0).toInt() >= nperiods))
                            m_items[pos2].currentValues[atable.value(0).toInt()-1] = atable.value(1);
                        temp++;
                    }
 
                    qWarning() << "End of Setting data:" << temp;
                }
                else
                {
                    qWarning() << "Error: " << atable.lastError().databaseText();
                    qWarning() << "Executing: " << sql;
                }
 
                ...
            }
        }
        else
        {
            qWarning() << "Error: " << lktable.lastError().databaseText();
            qWarning() << "Executing: " << sql;
        }
    }

exec() does not return false, but Although the sql excuted in "if (atable.exec(sql))" is correct (! tested in a terminal) an should return 12 rows. atable is invalid but enters into the while(atable.next()) resulting in temp = 1 ....

Why if it is invalid next returns true!

Thanks,
Carlos.