I am trying to get nested transactions to work using 2 sql command objects

SqlTransaction myTrans = SqlConn.BeginTransaction();

HeaderCmd = poh.InsertCommand;
HeaderCmd.Transaction = myTrans;

if(poh.UpdateInsertdata(HeaderCmd, Header))
{
     DetailsCmd = pod.InsertCommand;
     DetailsCmd.Transaction = myTrans;

     if(pod.UpdateInsertData(DetailsCmd, Details))
        GoodTrans= true;
}
if(GoodTrans)
    myTrans,Commit();
else
    myTrans.Rollback();

Both of these command share the same transaction.

I am forcing an error to occur during the detail portion of the code. But when I hit
myTrans.Rollback() I am greeted with:

The ROLLBACK TRANSACTIOn request has no corresponding BEGIN TRANSACTION.

Anyone have a clue?

Doug