protected void setPropReportUnit(MResource res, JasperDesign jd) {
   if (!res.getValue().isMainReport())
     jd.setProperty(AExporter.PROP_REPORTRESOURCE, res.getValue().getUriString());
   MReportUnit repunit = res.getReportUnit();
   if (repunit != null) {
     ResourceDescriptor runit = repunit.getValue();
     if (runit != null) jd.setProperty(AExporter.PROP_REPORTUNIT, runit.getUriString());
   } else jd.getPropertiesMap().removeProperty(AExporter.PROP_REPORTUNIT);
 }