[rules-users] Help me improve my rules performance.

[ABRA2]

Thanks  a lot. Your suggestions has helped me improve my rule's performance.
I have two more rule i need help with. 

1. How do i check for condition of boolean variable without using eval like
in the case below? 

rule CheckValidBinNumber
when
   $br:BillingRecord(cardNo!=null || cardNo!="")
   $valid: Boolean() from checkValidity($br.cardNo)
   eval(!($valid))
then
   error(BillingRecordHelper.BIN_NO_INVALID_ERROR,log);
end

2. How do i check if the value of variable created in when part without
using eval? getMerchantNo is a function defined in the .drl file. If i dont
use the condition eval($mno!="") then my rules gets fired in an infinte loop
because there is one more rule which sets the value of billingActionCd in
BillingRecord in working memory and it also triggers this rule. 

rule AssignMerchantNumber
when
   $br:BillingRecord(merchantNo==null || merchantNo=="")
   $mno:String() from getMerchantNo($br.billingActionCd, $br.cardType,
$br.salesSourceTypeCode, $br.posId)
   eval($mno!="")
then
    modify($br){setMerchantNo($mno);}
    info(BillingRecordHelper.MERCHANT_NO_ASSIGNED_INFO,log);
end

I really appreciate your timely help for improving my rules.

thanks
ABRA2
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