void assertInstance(MyRelation rel, CallingContext cc)
        throws ODKEntityPersistException, ODKOverQuotaException {
      Datastore ds = cc.getDatastore();
      User user = cc.getCurrentUser();

      for (int i = 0; i < SET_SIZE; ++i) {
        MyRelation element = ds.createEntityUsingRelation(rel, user);
        element.setStringField(MyRelation.fieldStr, str);
        element.setLongField(MyRelation.fieldInt, Long.valueOf(i));
        element.setNumericField(MyRelation.fieldDbl, bd);
        element.setDateField(MyRelation.fieldDate, d);
        element.setBooleanField(MyRelation.fieldBool, b);

        ds.putEntity(element, user);
      }

      for (int i = 0; i < SET_SIZE; ++i) {
        MyRelation element = ds.createEntityUsingRelation(rel, user);
        element.setStringField(MyRelation.fieldStr, str);
        element.setLongField(MyRelation.fieldInt, Long.valueOf(i));
        element.setNumericField(MyRelation.fieldDbl, BigDecimal.valueOf(i));
        element.setDateField(MyRelation.fieldDate, d);
        element.setBooleanField(MyRelation.fieldBool, b);

        ds.putEntity(element, user);
      }
    }