[rules-users] PlanningVariables are sometimes null

Hi, I've got an planningEntity with two planningVariables. For both variables I build a list of objects. While solving, it seems that the planningEntity objects are sometimes called without setting the planning variables. When I read an attribute of such a variable in a rule I get a NPE, ofcourse. Is it possible to always have the planningsvariables to be set before executing a rule? Or am I missing the obvious? Thanks, Michiel   ----------------- http://www.codessentials.com - Your essential software, for free! Follow us at http://twitter.com/#!/Codessentials