AX7 FormDataSource level validation using Onvalidated EventHandler

class NEC_InventJournalLossProfitFormEventHandler
{
   
    /// <summary>
    ///
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    [FormDataFieldEventHandler(formDataFieldStr(InventJournalLossProfit, InventJournalTrans, Qty), FormDataFieldEventType::Validated)]
    public static void Qty_OnValidated(FormDataObject sender, FormDataFieldEventArgs e)
    {
        FormDataSource      inventJournalTrans_ds = sender.datasource();
        InventJournalTrans  inventJournalTrans = inventJournalTrans_ds.cursor();

        if(InventJournalName::find(inventJournalTrans.inventJournalTable().JournalNameId).NEC_NegativeQtyOnly == NoYes::Yes && inventJournalTrans.Qty > 0)
        {
            FormDataFieldCancelEventArgs ce = e as FormDataFieldCancelEventArgs;
            ce.cancel(!checkFailed("Quantity cannot be positive"));
        }
    }

}