I have very simple named query on JPA (toplink ):

UPDATE Server s SET s.isECM = 0

I don't carry about cache or validity of already preloaded entities. But database connection is performed from restricted account (only INSERT/UPDATE/DELETE). It is appeared that toplink on this query executes (and failed since TL_Server is not exists) very strange SQL:

INSERT INTO TL_Server (elementId, IsECM) 
    SELECT t0.ElementId, ? 
    FROM Element t0, Server t1 
    WHERE ((t1.elementId = t0.ElementId) AND (t0.elementType = ?))

bind => [0, Server]

What is this? How the simple UPDATE appears an INSERT? Why toplink queries TL_?