Hi, When the type variable changes, the old type is deleted. It's ok But when I check in my db, I see that all the field are set to null even the name. In the hibernate log : | Hibernate: update JBPM_VARIABLEINSTANCE set TASKINSTANCE_=null, NAME_=null where TASKINSTANCE_=? and ID_=? | It's normal that even the name are set to null ? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4032703#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...