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The below code needs to be added just before the tag <NewPaperSizeForAllReports> in CustomReporting.xml file in ..\IIS\EXTUI\ILRT folder under Web Server
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<Reports>
                <Report ReportName="certi_of_maint_sr_report.rpt"> 
                <ReportType Name = "crystal"> 
                <ReportParameterOption> 
                                <ReportParameterOuRoleDetails> 
                                <OURoleReportParameter ouid="" RoleName = "" > 
                                <ReportParameters> 
                                                <ReportParameter Name="" Value="" SubReportName=""/> 
                                </ReportParameters> 
                                </OURoleReportParameter> 
                                </ReportParameterOuRoleDetails> 
                                <ReportParameterRoleDetails> 
                                <RoleReportParameter RoleName = "" > 
                                <ReportParameters> 
                                                <ReportParameter Name="" Value="" SubReportName=""/> 
                                </ReportParameters> 
                                </RoleReportParameter> 
                                </ReportParameterRoleDetails> 
                                <ReportParameterOuDetails> 
                                <OUReportParameter ouid="" > 
                                <ReportParameters> 
                                                <ReportParameter Name="" Value="" SubReportName=""/> 
                                </ReportParameters> 
                                </OUReportParameter> 
                                </ReportParameterOuDetails> 
                                <ReportParameterDetails> 
                                <ReportParameters> 
                                                <ReportParameter Name="reportlogo" Value="D:\Program Files (x86)\VirtualWorks\IIS\ExtUi\ReportLogo\reportlogo.bmp" SubReportName="certi_of_maint_arc_sr_report.rpt" /> 
                                                <ReportParameter Name="reportlogo" Value="D:\Program Files (x86)\VirtualWorks\IIS\ExtUi\ReportLogo\reportlogo.bmp"                        SubReportName="certi_of_maint_arca_sr_report.rpt" /> 
                                                <ReportParameter Name="reportlogo" Value="D:\Program Files (x86)\VirtualWorks\IIS\ExtUi\ReportLogo\reportlogo.bmp"                        SubReportName="certi_of_maint_ch_report_subreport1.rpt" /> 
                                                <ReportParameter Name="reportlogo" Value="D:\Program Files (x86)\VirtualWorks\IIS\ExtUi\ReportLogo\reportlogo.bmp"                        SubReportName="certi_of_maint_arc_easa2_subrpt7.rpt" />
                                                <ReportParameter Name="reportlogo" Value="D:\Program Files (x86)\VirtualWorks\IIS\ExtUi\ReportLogo\reportlogo.bmp"                        SubReportName="certi_of_maint_arc_g8130_subrpt8.rpt" />
                                                <ReportParameter Name="reportlogo" Value="D:\Program Files (x86)\VirtualWorks\IIS\ExtUi\ReportLogo\reportlogo.bmp"                        SubReportName="certi_of_maint_arc_easa1_subrpt6.rpt" />
                                </ReportParameters> 
                                </ReportParameterDetails> 
                </ReportParameterOption> 
                </ReportType> 
                </Report> 
</Reports>