{
      FeatureMapUtil.Validator validator = FeatureMapUtil.getValidator(owner.eClass(), entryFeature);
      for (int i = 0, size = delegateSize(); i < size; ++i)
      {
        Entry otherEntry = delegateGet(i);
        if (validator.isValid(otherEntry.getEStructuralFeature()))
        {
          throw new IllegalArgumentException("The multiplicity constraint is violated");
        }
      }
    }