Replacing standard report with our report

Here i want to discuss about that how can we replace SalesInvoice standard report with our MySalesInvoicereport  in which i hav SalesTable and SalesLine as datasources

Then do the following ,

In printjournal() of custInvoiceJour table just change the menuitem  SalesInvoice to MyReportSalesInvoice

salesInvoiceMenu = new MenuFunction(menuitsemoutputstr(MyReportSalesInvoice),MenuItemType::Output);

Go to our MySalesInvoicereport 

In class declaration and declare the variables as

    SalesFormLetter                               salesFormLetter;

    SalesFormLetterReport_Invoice       salesFormLetterReport;

    RecordSortedList                             journalList;

    Salesid                                              salesid;               

     custInvoiceJour                                            custInvoiceJour;

In init() write the code as

super();

if (classidget(element.args().caller()) == classnum(SalesFormLetter_Invoice))

    {

        salesFormLetter = element.args().caller();

    }

else

    {

        if (element.args().record())

            journalList         = FormLetter::createJournalListCopy(element.args().record());

        else

            journalList         = element.args().object();

    }

    if (!journalList)

        throw '';

    journalList.first(custInvoiceJour);

    if (!custInvoiceJour)

        throw error("@SYS26348");

salesid  =  custInvoiceJour.salesId

In fetch() try to run the report on the basis of CustInvoiceJour

public boolean fetch()

{

    boolean ret;

    ;

    ret = true;

    select SalesTable_1 where SalesTable_1.SalesId == _salesId;

    if(SalesTable_1)

    element.send(SalesTable_1);

    while select salesLine_1 where salesLine_1.SalesId == _salesId

    {

    element.send(salesLine_1);

    }

    return ret;

}