Salesupdate form popping up when posting Sales order invoice

Hi All,

When I am posting sales order invoice using the following code, Sales update filter query form pops up:

SalesFormLetter_Invoice salesFormLetter = SalesFormLetter::construct(DocumentStatus::Invoice);

    SalesTable salesTable = SalesTable::find('SO-101144');

    salesFormLetter.initParameters(salesFormLetter.salesParmUpdate(),

                                    Printout::After,

                                    NoYes::Yes,

                                    NoYes::No,

                                    NoYes::Yes,

                                    NoYes::Yes

                                    );

    salesFormLetter.update(salesTable,

                            systemdateget(),

                            SalesUpdate::PackingSlip,

                            AccountOrder::None,

                            false,

                            false

                            );

Does anyone have an idea why this form is popping up during invoice posting or how to suppress this?