[rules-users] Rule activation when using from

Hi, is there a way to make drools re-evaluate the LHS of a rule when using from? What I try to achieve is, that following rule is evaluated for every call of fireAllRules() : global java.util.Calendar cal rule "test" when java.util.Calendar() from cal then System.out.println("here we go"); end Drools evaluates the rule only in the first call of fireAllRules(). Kind regards