[rules-users] Truth maintenance

Hi, I have a question concerning the truth maintenance mechanism in Drools: Is it possible to exclude some preconditions from truth maintenance? We want to implement a rule flow by using an attribute of a special fact (ProcessPhaseController.phase). We have some phases that we want to traverse. In each phase only some of our rules should be activated. Therefore all of our rules test for a certain phase; e.g.: when ProcessPhaseController(phase == ProcessPhase.EXEC) ... When no rule of the current phase is activated, a special rule changes the phase to the next one and the rules of the next phase are evaluated. The problem now is that we have some rules with logical inserts. So each time the phase is changed, all of these inserts are retracted. To prevent this I would like to exclude the condition "ProcessPhaseController(phase == ProcessPhase.EXEC)" from truth maintenance. Is this possible? Thanks in advance! Cheers, Andreas -- Andreas Volz Consultant mailto:andreas.volz@valtech.de Mobile: +49 173 5955343 Valtech GmbH Zweigstraße 10 80336 München Germany Phone: +49 89 893242-0 Fax: +49 89 893242-31 http://www.valtech.de Geschäftsführer: Ingo Kriescher Amtsgericht Düsseldorf HRB48672