public CustomField findCustomField(String entityName, String fieldName) {
   Entity entity = findLatestEntityVersionByName(entityName);
   if (entity == null) {
     return null;
   }
   EntityAttribute attrib = entityDefinitionDao.findCustomField(entity, fieldName);
   if (attrib == null) {
     return null;
   }
   CustomField field = buildCustomFieldFromAttribute(attrib);
   if (log.isDebugEnabled()) {
     log.debug("Found custom field: " + field);
   }
   return field;
 }