[rules-dev] Trouble using constants to access Maps

Hi all!

I'm writing a rule that contains the following statement:

$agreementOffer:AgreementOffer($logicalFixedNumber:configurationParameters["6410"])

This results of this is not surprisingly that both $agreementOffer and
$logicalFixedNumber get assigned a value. 
Instead of using the "magic value" 6410, I want to use ParameterId constant
class, which implements the toString() to return the value.

I have tried several different ways to refer to the constant but without
luck. The errors says: 

Unable to create Field Extractor for
'configurationParameters[ParameterId.LOGICAL_NUMBER_FIXED]
I have also tried to extract the value of the
ParameterId.LOGICAL_NUMBER_FIXED into a local variable, which I can see
prints the correct value, but the error says the same: 

Unable to create Field Extractor for
'configurationParameters[$logicalNumberFixedConstant]

Do anyone understand what is happening here and what I do wrong? 

I'm are still on the JKD 1.4, and uses MVEL 1.3

Thanks, 

@ndré
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