i created a feature request for this 
http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3910206#3910206

i don't think that validation should have the focus here (of course it must be 
possible to have jbpm throw an exception when an unavailable transition is 
being taken)

the focus should be on the implementation of the methods:
Token.getAvailableTransitions();
TaskInstance.getAvailableTransitions();
So that the user interface knows how to avoid offering buttons that the user is 
not allowed to push.

should we introduce 2 levels token and task instance ?

regards, tom.

View the original post : 
http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3910240#3910240

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