[rules-users] Difference between constraint within a pattern and eval

[Mohan]

Hi There,

I am facing a weird issue, following rule doesn't run 
rule "test"
	dialect "mvel"
	when
		Experience( primary == "SY") )
	then
		log.debug("SY");
end

but following works. :confused:
rule "test1"
	dialect "mvel"
	when
		exp : Experience( eval(exp.getPrimary() == "SY") )
	then
		log.debug("SY");
end

Whats the difference between the two,mean why second works but the first one
doesnt? I have used former expression in many other rules but haven't
encountered this problem.

Advance thanks for your response. 

--MRaj
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