I may be way off track, but I saw score corruption like yours in two cases:

1) broken .equals()/.hashCode() method.
I had a couple of model classes that accidentally looked at mutable data in their .equals() and .hashCode() methods. When these were applied as the cause of the constraint, the revert action then failed to find the constraint because the removed instance wasn't .equals() to the inserted instance. I solved this by reverting to Object.equals() and Object.hashCode().

2) broken variable assignment in aggregate predicates (https://issues.jboss.org/browse/JBRULES-3482)
This is fixed in 5.4.0.Final.
If your rules use collect() or accumulate() with a complicated first argument to either, then Drools becomes confused about which variable to assign the value to. In most cases, this results in a ClassCastException. But in some cases where the facts happened to be the same class, you ended up with the wrong fact assigned as the cause of the constraint.

-----Original Message-----
From: rules-users-bounces@lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Nurlan
Sent: Friday, May 11, 2012 5:06 PM
To: rules-users@lists.jboss.org
Subject: [rules-users] Score curruption exception in drools-planner-5.4.0.CR1

Hi guys!
I have some exception and I don't know why?
My rule *someRuleId* has weight *1*
2012-05-12 03:47:08,224 [main] DEBUG     Step index (570), time spend
(115566), score (0hard/0soft), initialized planning entity
(SomePlanningEntity [id=21, …]).
2012-05-12 03:47:08,465 [main] DEBUG     Step index (571), time spend
(115807), score (0hard/0soft), initialized planning entity
(SomePlanningEntity [id=20, …]).
java.lang.IllegalStateException: Score corruption: the workingScore
(-4hard/0soft) is not the uncorruptedScore (0hard/0soft):
 The workingMemory has 4 ConstraintOccurrence(s) in excess:
   someRuleId/NEGATIVE_HARD:[SomePlanningEntity [id=2482309, …],
SomePlanningEntity [id=54, …]]=1
   someRuleId/NEGATIVE_HARD:[SomePlanningEntity [id=2482309, …],
SomePlanningEntity [id=57, …]]=1
   someRuleId/NEGATIVE_HARD:[SomePlanningEntity [id=57, …],
SomePlanningEntity [id=2482309, …]]=1
   someRuleId/NEGATIVE_HARD:[SomePlanningEntity [id=54, …],
SomePlanningEntity [id=2482309, …]]=1
 Check the score rules who created those ConstraintOccurrences. Verify that
each ConstraintOccurrence's causes and weight is correct.
       at
org.drools.planner.core.score.director.AbstractScoreDirector.assertWorkingScore(AbstractScoreDirector.java:101)
       at
org.drools.planner.core.constructionheuristic.greedyFit.decider.DefaultGreedyDecider.doMove(DefaultGreedyDecider.java:111)
       at
org.drools.planner.core.constructionheuristic.greedyFit.decider.DefaultGreedyDecider.decideNextStep(DefaultGreedyDecider.java:78)
       at
org.drools.planner.core.constructionheuristic.greedyFit.DefaultGreedyFitSolverPhase.solve(DefaultGreedyFitSolverPhase.java:63)
       at
org.drools.planner.core.solver.DefaultSolver.runSolverPhases(DefaultSolver.java:183)
       at
org.drools.planner.core.solver.DefaultSolver.solve(DefaultSolver.java:151)
       …
       …


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