anchor.diff:              events.get(category).add(event);
           }
       } catch (WorkflowAdminServiceWorkflowException e) {
  +        // Removing the filter attributed from the session if an exception occurred.
  +        session.removeAttribute(REQUEST_TYPE_FILTER);
  +        session.removeAttribute(REQUEST_STATUS_FILTER);
  +        session.removeAttribute(CREATED_AT_FROM);
  +        session.removeAttribute(CREATED_AT_TO);
  +        session.removeAttribute(TIME_CATEGORY_TO_FILTER);
           String message = resourceBundle.getString("workflow.error.when.listing.services");
           CarbonUIMessage.sendCarbonUIMessage(message, CarbonUIMessage.ERROR, request);
           forwardTo = ADMIN_ERROR_PAGE;
       } catch (AxisFault e) {
  +        // Removing the filter attributed from the session if an exception occurred.
  +        session.removeAttribute(REQUEST_TYPE_FILTER);
  +        session.removeAttribute(REQUEST_STATUS_FILTER);
  +        session.removeAttribute(CREATED_AT_FROM);
  +        session.removeAttribute(CREATED_AT_TO);
  +        session.removeAttribute(TIME_CATEGORY_TO_FILTER);
           String message = resourceBundle.getString("workflow.error.when.initiating.service.client");
           CarbonUIMessage.sendCarbonUIMessage(message, CarbonUIMessage.ERROR, request);
           forwardTo = ADMIN_ERROR_PAGE;
  
positive.code:         client = new WorkflowAdminServiceClient(cookie, backendServerURL, configContext);
  
          if (taskTypeFilter == null) {
              taskTypeFilter = "";
          }
          if (statusToFilter == null) {
              statusToFilter = "";
          }
          if (lowerBound == null) {
              lowerBound = "";
          }
          if (upperBound == null) {
              upperBound = "";
          }
          if (timeFilterCategory == null) {
              timeFilterCategory = CREATED_AT;
          }
  
  
          if (ALL_TASKS.equals(taskTypeFilter)) {
  
negative.code:                                 <td style="border:0; !important">
                                      <nobr>
                                          <label for="createdAtFrom">From</label>
                                          <input type="text" id="createdAtFrom" value="<%=lowerBound%>" name="createdAtFrom">
                                          <label for="createdAtTo">to</label>
                                          <input type="text" id="createdAtTo" value="<%=upperBound%>" name="createdAtTo">
                                      </nobr>
                                  </td>
                              </tr>
  