https://denistrunin.com/xpptools-reportsalesinvoice/ Steps to follow for extending sales invoice report ------------------------------------------------------------------------------------ [ ExtensionOf ( classstr ( PrintMgmtReportFormatPopulator ))] final class PrintMgmtReportFormatPopulator_Extension { protected void addDocuments() { this .addStandard( PrintMgmtDocumentType ::SalesOrderInvoice); next addDocuments(); } } ------------------------------------------------------------------------------------------ [ ExtensionOf ( ClassStr ( SalesInvoiceController ))] final class SalesInvoiceController_Extension { protected void initFormLetterReport() { next initFormLetterReport(); thi...