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