ORA-00928: missing SELECT keyword when inserting entry with Oracle cache store

MERGE INTO "ISPN_cache" USING (VALUES ('Az4s','030',1)) AS tmp (datum, version, id) ON (datum = tmp.datum) WHEN MATCHED THEN UPDATE SET version = tmp.version, id = tmp.id WHEN NOT MATCHED THEN INSERT (datum, version, id) VALUES (tmp.datum, tmp.version, tmp.id)