By way of an update; if the retraction is made within a different Agenda Group the rules work as expected.

However the problem of the retraction having no obvious affect when operated within the same Agenda Group remains.

Is this a bug?

_____________________________________________
From:   Anstis, Michael (M.) 
Sent:   26 January 2007 11:32
To:     'Rules Users List'
Subject:        Why not retracting?

Hello,

I have the following rules; one removes "Prices" that do not have the required "Economic Level" from working memory, the other calculates a "Costs":-

rule "Cost - remove prices that do not have the required 'Economic Level'"
agenda-group "stamping-costs"
//salience 1
when
        p : Price ( economicLevel != ( Utilities.makeDate(1, 1, 2007) ) )
then
        System.out.println("Retracting "+p.toString());
        retract(p);
end

rule "Cost - calculate cost for 'Stamping process' on a process"
agenda-group "stamping-costs"
//salience 2
when
        r : ResourceEntry ( m : machine )
        //p : Price ( economicLevel == ( Utilities.makeDate(1, 1, 2007) ), machine == ( m ) )
        p : Price ( machine == ( m ) )
then
        Cost cost = new Cost(r, p);
        cost.setCost((float) (r.getUsage() * p.getRate()));
        assert(cost);
end

The problem is that the "Cost" rule still works upon ALL "Prices" (even those with an incorrect "Economic Level").

If I change the line in the "Cost" rule to also check the "Economic Level" the rules work as expected (i.e. "Costs" are only calculated using "Prices" with an "Economic Level" of 01/01/2007).

I've tried using "salience" levels too (as commented in the above Rules) but this doesn't have any effect either.

What am I doing wrong?

Cheers,

Mike