Dynamic Query with Prompt in Ax 2012

static void Job23(Args _args)
{
    QueryBuildDataSource queryBuildDataSource;
    QueryBuildRange queryBuildRange;
    QueryRun queryRun;
    Query    query;
    Qty total;
    InventTrans inventTrans;
    inventDim inventDim;
    query = new Query();
   
    queryBuildDataSource = query.addDataSource(tableNum(InventTrans));
    queryBuildDataSource.addSelectionField(fieldNum(InventTrans,Qty),SelectionField::Sum);
    queryBuildRange      = queryBuildDataSource.addRange(fieldNum(InventTrans,ItemId));
    queryBuildDataSource = queryBuildDataSource.addDataSource(tableNum(InventDim));
    queryBuildDataSource.addGroupByField(fieldNum(InventDim,InventBatchId));
    queryBuildDataSource.relations(true);
    queryRun = new QueryRun(query);
   
    if (queryRun.prompt())
    {
        while (queryRun.next())
        {
            inventTrans = queryRun.get(tableNum(InventTrans));
            inventDim   = queryRun.get(tableNum(inventDim));
            info(strFmt("Batch %1, qty %2",inventDim.inventBatchId, inventTrans.qty));
        }
    }
}