@RequestMapping(value = "/create", method = RequestMethod.POST)
  @RequireHardLogIn
  public String createUserGroup(
      @Valid final B2BUserGroupForm userGroupForm,
      final BindingResult bindingResult,
      final Model model,
      final RedirectAttributes redirectModel)
      throws CMSItemNotFoundException {
    storeCmsPageInModel(model, getContentPageForLabelOrId(MANAGE_USERGROUPS_CMS_PAGE));
    setUpMetaDataForContentPage(model, getContentPageForLabelOrId(MANAGE_USERGROUPS_CMS_PAGE));
    final List<Breadcrumb> breadcrumbs =
        myCompanyBreadcrumbBuilder.createManageUserGroupBreadCrumbs();
    breadcrumbs.add(
        new Breadcrumb(
            "/my-company/organization-management/manage-usergroups/create",
            getMessageSource()
                .getMessage(
                    "text.company.manageUsergroups.createUsergroup.breadcrumb",
                    null,
                    "Create Usergroup ",
                    getI18nService().getCurrentLocale()),
            null));
    model.addAttribute("breadcrumbs", breadcrumbs);

    if (bindingResult.hasErrors()) {
      GlobalMessages.addErrorMessage(model, "form.global.error");
      model.addAttribute(userGroupForm);
      return createUserGroup(model);
    }
    if (b2bCommerceB2BUserGroupFacade.getUserGroupDataForUid(userGroupForm.getUid()) != null) {
      // a unit uid is not unique
      GlobalMessages.addErrorMessage(model, "form.global.error");
      bindingResult.rejectValue("uid", "form.b2busergroup.notunique");
      model.addAttribute(userGroupForm);
      return createUserGroup(model);
    }

    final B2BUserGroupData userGroupData = new B2BUserGroupData();
    userGroupData.setUid(userGroupForm.getUid());
    userGroupData.setName(userGroupForm.getName());
    if (StringUtils.isNotBlank(userGroupForm.getParentUnit())) {
      userGroupData.setUnit(companyB2BCommerceFacade.getUnitForUid(userGroupForm.getParentUnit()));
    }

    try {
      b2bCommerceB2BUserGroupFacade.updateUserGroup(userGroupForm.getUid(), userGroupData);
    } catch (final DuplicateUidException e) {
      GlobalMessages.addErrorMessage(model, "form.global.error");
      bindingResult.rejectValue("uid", "form.b2busergroup.notunique");
      return createUserGroup(model);
    }

    GlobalMessages.addFlashMessage(
        redirectModel, GlobalMessages.CONF_MESSAGES_HOLDER, "form.b2busergroup.success");

    return String.format(REDIRECT_TO_USERGROUP_DETAILS, urlEncode(userGroupForm.getUid()));
  }
  @RequestMapping(value = "/edit", method = RequestMethod.POST)
  @RequireHardLogIn
  public String editUserGroup(
      @RequestParam("usergroup") final String usergroup,
      @Valid final B2BUserGroupForm userGroupForm,
      final BindingResult bindingResult,
      final Model model,
      final RedirectAttributes redirectModel)
      throws CMSItemNotFoundException {
    storeCmsPageInModel(model, getContentPageForLabelOrId(MANAGE_USERGROUPS_CMS_PAGE));
    setUpMetaDataForContentPage(model, getContentPageForLabelOrId(MANAGE_USERGROUPS_CMS_PAGE));
    final List<Breadcrumb> breadcrumbs =
        myCompanyBreadcrumbBuilder.createManageUserGroupDetailsBreadCrumbs(usergroup);
    breadcrumbs.add(
        new Breadcrumb(
            String.format(
                "/my-company/organization-management/manage-usergroups/edit?usergroup=%s",
                urlEncode(usergroup)),
            getMessageSource()
                .getMessage(
                    "text.company.manageUsergroups.editUsergroup.breadcrumb",
                    new Object[] {usergroup},
                    "Edit {0} Usergroup ",
                    getI18nService().getCurrentLocale()),
            null));
    model.addAttribute("breadcrumbs", breadcrumbs);

    if (bindingResult.hasErrors()) {
      GlobalMessages.addErrorMessage(model, "form.global.error");
      model.addAttribute(userGroupForm);
      return editUserGroup(usergroup, model);
    }
    if (!userGroupForm.getUid().equals(usergroup)
        && b2bCommerceB2BUserGroupFacade.getB2BUserGroup(userGroupForm.getUid()) != null) {
      // a unit uid is not unique
      GlobalMessages.addErrorMessage(model, "form.global.error");
      bindingResult.rejectValue("uid", "form.b2busergroup.notunique");
      model.addAttribute(userGroupForm);
      return editUserGroup(usergroup, model);
    }

    final B2BUserGroupData userGroupData = b2bCommerceB2BUserGroupFacade.getB2BUserGroup(usergroup);
    if (userGroupData != null) {
      boolean userGroupUpdated = false;

      userGroupData.setUid(userGroupForm.getUid());
      userGroupData.setName(userGroupForm.getName());
      if (StringUtils.isNotBlank(userGroupForm.getParentUnit())) {
        final B2BUnitData newUserGroup =
            companyB2BCommerceFacade.getUnitForUid(userGroupForm.getParentUnit());
        if (!newUserGroup.getUid().equals(userGroupData.getUnit().getUid())) {
          userGroupUpdated = true;
        }

        userGroupData.setUnit(newUserGroup);
      }

      try {
        b2bCommerceB2BUserGroupFacade.updateUserGroup(
            userGroupForm.getOriginalUid(), userGroupData);
      } catch (final DuplicateUidException e) {
        GlobalMessages.addErrorMessage(model, "form.global.error");
        bindingResult.rejectValue("uid", "form.b2busergroup.notunique");
        return editUserGroup(usergroup, model);
      }

      if (userGroupUpdated) {
        GlobalMessages.addFlashMessage(
            redirectModel,
            GlobalMessages.INFO_MESSAGES_HOLDER,
            "form.b2busergroup.parentunit.updated");
      } else {
        GlobalMessages.addFlashMessage(
            redirectModel, GlobalMessages.CONF_MESSAGES_HOLDER, "form.b2busergroup.success");
      }

      return String.format(REDIRECT_TO_USERGROUP_DETAILS, urlEncode(userGroupForm.getUid()));

    } else {
      // user has no permissions to edit the group.
      GlobalMessages.addErrorMessage(model, "form.b2busergroup.noeditpermissions");
      model.addAttribute(userGroupForm);
      return editUserGroup(usergroup, model);
    }
  }