orm.xml version="2.0" doesn't work

I'm using an orm.xml file with a JPA 2.0 declaration :
<entity-mappings xmlns="http://java.sun.com/xml/ns/persistence/orm"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence/orm http://java.sun.com/xml/ns/persistence/orm_2_0.xsd"
version="2.0">
</entity-mappings>

When I create a Hibernate configuration (database connection is reused from DTP and property file is an existing one), then I get the following stacktrace. I thought that https://jira.jboss.org/browse/JBIDE-6842 had fixed this issue.

org.hibernate.console.HibernateConsoleRuntimeException: Could not create JPA based Configuration
Could not create JPA based Configuration
<No message>
java.lang.reflect.InvocationTargetException
java.lang.reflect.InvocationTargetException: <no message>
java.lang.reflect.InvocationTargetException
javax.persistence.PersistenceException: [PersistenceUnit: hskaPersistence] Unable to configure EntityManagerFactory
[PersistenceUnit: hskaPersistence] Unable to configure EntityManagerFactory
org.hibernate.MappingException: Error while parsing file: META-INF/orm.xml
Error while parsing file: META-INF/orm.xml
org.hibernate.MappingException: invalid mapping
invalid mapping
org.xml.sax.SAXParseException: cvc-complex-type.3.1: Value '2.0' of attribute 'version' of element 'entity-mappings' is not valid with respect to the corresponding attribute use. Attribute 'version' has a fixed value of '1.0'.
cvc-complex-type.3.1: Value '2.0' of attribute 'version' of element 'entity-mappings' is not valid with respect to the corresponding attribute use. Attribute 'version' has a fixed value of '1.0'.