final MasterReport report = new MasterReport();
report.setPageDefinition(new SimplePageDefinition(new PageSize(800, 300)));
report.setDataFactory(new TableDataFactory("query", tableModel));
report.setQuery("query");
final DesignTimeDataSchemaModel dataSchemaModel = new DesignTimeDataSchemaModel(report);
final RelationalReportBuilder builder = new RelationalReportBuilder(dataSchemaModel);
builder.addGroup(ROW_DIMENSION_A);
builder.addGroup(ROW_DIMENSION_B);
builder.addDetails(VALUE, aggFun, VALUE_BACKGROUND);
builder.addDetails("row-a-sum", null, ROWA_BACKGROUND);