transactions

[toto]

Hi,

I'm trying to use transactions with torque but it does not seem to work...
here's roughtly what i wrote :
Connection con = null;
   try {
            con = Transaction.begin("mydb");
            o.setCredit(1000$);   // my torque data object
             ...  
             o.save();
             retval = callSomeChargeOperation(1000$, ...);
             if (retval < 0) Transaction.rollback(con);  
              else Transaction.commit(con);
   } catch (TorqueException te) {
           Transaction.rollback(con);
   }

The rollback does not work!
Changes have effectively been applied to the database when rollback() 
returns.
What's wrong? what should I write to make transactions work properly?

BTW, i'm running torque 3.0.2

thanks in advance,
enrico
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