I have a named query with an ENUM WHERE parameter defined as:
@NamedQuery(name = StateArchive.UPDATE_OBJECTID, query = "UPDATE StateArchive a SET a.objectId = :objectId WHERE a.caseId = :caseId AND a.controlEvent = com.logitags.cibet.core.ControlEvent.DELETE")

Creation of the EntityManagerFactory fails with following Exception:

2013-07-20 11:40:15,605 ERROR [ main] (ErrorCounter.java:reportError:50) - line 1:168: unexpected token: .
line 1:168: unexpected token: .
at org.hibernate.hql.internal.antlr.HqlBaseParser.primaryExpression(HqlBaseParser.java:876)
at org.hibernate.hql.internal.antlr.HqlBaseParser.atom(HqlBaseParser.java:3472)
at org.hibernate.hql.internal.antlr.HqlBaseParser.unaryExpression(HqlBaseParser.java:3250)
at org.hibernate.hql.internal.antlr.HqlBaseParser.multiplyExpression(HqlBaseParser.java:3122)
at org.hibernate.hql.internal.antlr.HqlBaseParser.additiveExpression(HqlBaseParser.java:2828)
at org.hibernate.hql.internal.antlr.HqlBaseParser.concatenation(HqlBaseParser.java:568)
at org.hibernate.hql.internal.antlr.HqlBaseParser.relationalExpression(HqlBaseParser.java:2595)
at org.hibernate.hql.internal.antlr.HqlBaseParser.equalityExpression(HqlBaseParser.java:2551)
at org.hibernate.hql.internal.antlr.HqlBaseParser.negatedExpression(HqlBaseParser.java:2420)
at org.hibernate.hql.internal.antlr.HqlBaseParser.logicalAndExpression(HqlBaseParser.java:2346)
at org.hibernate.hql.internal.antlr.HqlBaseParser.logicalOrExpression(HqlBaseParser.java:2301)
at org.hibernate.hql.internal.antlr.HqlBaseParser.expression(HqlBaseParser.java:2011)
at org.hibernate.hql.internal.antlr.HqlBaseParser.logicalExpression(HqlBaseParser.java:1787)
at org.hibernate.hql.internal.antlr.HqlBaseParser.whereClause(HqlBaseParser.java:452)
at org.hibernate.hql.internal.antlr.HqlBaseParser.updateStatement(HqlBaseParser.java:222)
at org.hibernate.hql.internal.antlr.HqlBaseParser.statement(HqlBaseParser.java:140)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.parse(QueryTranslatorImpl.java:266)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:180)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:136)
at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:105)
at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:80)
at org.hibernate.engine.query.spi.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:168)
at org.hibernate.internal.SessionFactoryImpl.checkNamedQueries(SessionFactoryImpl.java:1071)
at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:519)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1751)
at org.hibernate.ejb.EntityManagerFactoryImpl.<init>(EntityManagerFactoryImpl.java:94)
at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:920)
at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:904)
at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:59)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:63)

and

2013-07-20 11:40:15,637 ERROR [ main] (SessionFactoryImpl.java:<init>:524) - HHH000177: Error in named query: com.logitags.cibet.actuator.archive.StateArchive.UPDATE_OBJECTID
org.hibernate.hql.internal.ast.QuerySyntaxException: unexpected token: . near line 1, column 168 [UPDATE com.logitags.cibet.actuator.archive.StateArchive a SET a.objectId = :objectId WHERE a.caseId = :caseId AND a.controlEvent = com.logitags.cibet.core.ControlEvent.DELETE]
at org.hibernate.hql.internal.ast.QuerySyntaxException.convert(QuerySyntaxException.java:54)
at org.hibernate.hql.internal.ast.QuerySyntaxException.convert(QuerySyntaxException.java:47)
at org.hibernate.hql.internal.ast.ErrorCounter.throwQueryException(ErrorCounter.java:79)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.parse(QueryTranslatorImpl.java:276)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:180)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:136)
at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:105)

However, when I use another ENUM value like com.logitags.cibet.core.ControlEvent.REDO the query passes.
I suspect that the Hibernate query parser fails when an ENUM value is an SQL keyword. I tested also with UPDATE and INSERT, they also fail.