[rules-users] Bug in "not" ???

[Tom.E.Murphy at wellsfargo.com]

Using Drools Expert 5.0.1

The following rule fires both when the "not" is there, and also if the "not" is commented out. Clearly, both cannot be true, so there is something wrong somewhere.

I've narrowed it down to the testing of the $parentEmploymentId declaration - the AccountHolder CE, which is inside the context of the "not", is referencing $parentEmploymentId, which is declared outside the "not".
If the indicated line is commented out, then the expression behaves sensibly (i.e. fires either when the "not" is used, or when it isn't, but not both). However, an important business semantic element is then missing from the rule.

Is this a bug in Drools, or am I misusing something?

rule "RS7713.9.2_"
when
        Employment ( $parentEmploymentId : myId )

        not # if the not is commented out, the rule still fires!!!!
        (
                AccountHolder
                (
                        $parentEmployerInfoId : myId
                        , parentId == $parentEmploymentId # if this line is commented, it behaves sensibly (per the 'not'), but misses an important business semantic
                )
                and
                BusinessName
                (
                        parentId == $parentEmployerInfoId
                        , lines contains "DISTRESS"
                )
        )
then
        ;
end


Tom Murphy
Business Process Consultant
Wells Fargo HCFG - CORE Deal Decisioning Platform
800 S. Jordan Creek Parkway | West Des Moines, IA 50266
MAC: X2301-01B
Office: 515 324 4853 | Mobile: 515 423 4334
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