MyCustomPersistenceHandler

    @Override
    public DynamicResultSet inspect(PersistencePackage persistencePackage, DynamicEntityDao dynamicEntityDao, InspectHelper inspectHelper) throws ServiceException {
        try {
            PersistencePerspective persistencePerspective = persistencePackage.getPersistencePerspective();
            Map<MergedPropertyType, Map<String, FieldMetadata>> allMergedProperties = new HashMap<MergedPropertyType, Map<String, FieldMetadata>>();

            //Grab the default properties for the Sku
            Map<String, FieldMetadata> properties = inspectHelper.getSimpleMergedProperties(PaymentResponseItem.class.getName(), persistencePerspective);

            //Create the metadata for the collection
            MapMetadata md = new MapMetadata();
            md.setFriendlyName("Additional Fields");
            md.setFieldName("additionalFields");
            md.setMutable(false);
            md.setKeyPropertyFriendlyName("Name");
            md.setTargetClass(PaymentResponseItemImpl.class.getName());
            md.setValuePropertyFriendlyName("Value");

            md.setAvailableToTypes(new String[]{PaymentResponseItemImpl.class.getName()});
            md.setDataSourceName("additionalFields");
            md.setFieldName("additionalFields");
            md.setOwningClass(PaymentResponseItemImpl.class.getName());

            properties.put("additionalFields", md);

            properties.remove("transactionSuccess");

            allMergedProperties.put(MergedPropertyType.PRIMARY, properties);
            Class<?>[] entityClasses = dynamicEntityDao.getAllPolymorphicEntitiesFromCeiling(PaymentResponseItem.class);
            ClassMetadata mergedMetadata = inspectHelper.getMergedClassMetadata(entityClasses, allMergedProperties);
            DynamicResultSet results = new DynamicResultSet(mergedMetadata, null, null);

            return results;
        } catch (Exception e) {
            ServiceException ex = new ServiceException("Unable to retrieve inspection results for " +
                    persistencePackage.getCeilingEntityFullyQualifiedClassname(), e);
            throw ex;
        }
    }