[rules-users] Question on eval block

[Shah, Malay]

Hi,
 
I am trying to use eval block in one of the rules and am a bit confused
about it. The rule is something like this:
 
rule "LastCapacity"
when
    e: Execution(lastCapacity:lastCapacity,parentOid:parentOid)
    eo:
ExecutionOrder(entityOid:entityOid,msgType:msgType,execType:execType)
    eval(lastCapacity != null && entityOid == parentOid && msgType ==
"8")
then

..................
end

where Execution and ExecutionOrder are 2 objects that are linked by an
ID. I expect eval to return true for certain sets of objects that I
send. But, the above rule exits without running the consequence. On the
other hand, when I write the rule as:

 rule "LastCapacity"
when
    e: Execution(lastCapacity:lastCapacity==null,parentOid:parentOid)
    eo: ExecutionOrder(entityOid:entityOid == parentOid, msgType == "8")
then

.............................
end

the rule triggers the consequence for same set of objects. I thought
that if the expression in eval block comes out to be true, the
consequence will be triggered. Am I missing something obvious here?
 
Thanks
 
Malay Shah


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