public IEnumerable <RelationMetadata> GetRelationsMetaData(string logicalName, MetadataHelpers.RelationType type)
        {
            var key = $"MetaDataHelper.GetRelationMetaData|{logicalName}|{type}";
            var cachedEntityMetaData = GetFromMemCache <IEnumerable <RelationMetadata> >(key);

            if (cachedEntityMetaData != null)
            {
                return(cachedEntityMetaData);
            }

            var retrievedMetaData = MetadataHelpers.GetEntityRelations(service, logicalName, type, CrmService.OrgId).ToList();

            if (retrievedMetaData.Count <= 0)
            {
                throw new Exception($"Couldn't find metadata for relations of type '{type}' in entity '{logicalName}'.");
            }

            return(AddToMemCache(key, retrievedMetaData));
        }