Edit Purchase order Confirmation Report

Hello every one,

i'm trying to change purchase order Confirmation report , i'm already duplicate (purchpurchaseorder) report and edit the design  and also added this class

class modPrintMgtDocTypeHandlersExt
{
    
    [SubscribesTo(classstr(PrintMgmtDocType), delegatestr(PrintMgmtDocType, getDefaultReportFormatDelegate))]
    public static void getDefaultReportFormatDelegate(PrintMgmtDocumentType _docType, EventHandlerResult _result)
    {

             case PrintMgmtDocumentType::PurchaseOrderConfirmationRequest:
                _result.result(ssrsReportStr(PurchPurchaseOrdeNew, Report));
                break;
            case PrintMgmtDocumentType::PurchaseOrderRequisition:
                _result.result(ssrsReportStr(PurchPurchaseOrdeNew, Report));
                break;

     }

}

and also change it in form setup but nothing changes in the layout