//add a rule on stem:a saying if not in stem:b, then dont allow add to stem:a
    AttributeAssign attributeAssign = ruleGroup
      .getAttributeDelegate().addAttribute(RuleUtils.ruleAttributeDefName()).getAttributeAssign();

    AttributeValueDelegate attributeValueDelegate = attributeAssign.getAttributeValueDelegate();

    attributeValueDelegate.assignValue(
        RuleUtils.ruleActAsSubjectSourceIdName(), "g:isa");
    attributeValueDelegate.assignValue(
        RuleUtils.ruleActAsSubjectIdName(), "GrouperSystem");
    attributeValueDelegate.assignValue(
        RuleUtils.ruleCheckOwnerNameName(), "stem:a");
    attributeValueDelegate.assignValue(
        RuleUtils.ruleCheckTypeName(), RuleCheckType.membershipAdd.name());
    attributeValueDelegate.assignValue(
        RuleUtils.ruleIfConditionEnumName(), RuleIfConditionEnum.groupHasNoImmediateEnabledMembership.name());
    attributeValueDelegate.assignValue(
        RuleUtils.ruleIfOwnerNameName(), "stem:b");
    attributeValueDelegate.assignValue(
        RuleUtils.ruleThenEnumName(), RuleThenEnum.veto.name());

    //key which would be used in UI messages file if applicable
    attributeValueDelegate.assignValue(
        RuleUtils.ruleThenEnumArg0Name(), "rule.entity.must.be.a.member.of.stem.b");

    //error message (if key in UI messages file not there)
    attributeValueDelegate.assignValue(
        RuleUtils.ruleThenEnumArg1Name(), "Entity cannot be a member of stem:a if not a member of stem:b");

    //should be valid
    String isValidString = attributeValueDelegate.retrieveValueString(
        RuleUtils.ruleValidName());

    if (!StringUtils.equals("T", isValidString)) {
      throw new RuntimeException(isValidString);
    }