Hi,

I am evaluating Drool Gunvor for to implement Rules for some finance related 
functionality.
I need help from users to implement following scenario is Drools-Guvnor

I have created simple Rule to Calculate  House Rent Allowance i.e. HRA as
   HRA = 0.12 * Basic salary .(Basic will come as Input Parameter).
This rule is valid from e.g. 01-Jan-2005 to 31-July-2010 as HRA rule is changed 
from 1st Aug 2010

I will have to create new Rule for HRA Rule with new formula as
HRA = 0.15 * Basic salary .(Basic will come as Input Parameter).
This rule is valid from 01-Aug-2010 to 01-Aug-2999

>From 1st Aug HRA should be calculated using New Rule. But at the same time if 
>any Arrears to be calculated(back dated calculation) depending on the date old 
>HRA rule should be applicable.

Can I achieve this in Gunor Drool? I could achieve first half by specifying 
date-expires . But I am not able to achieve second half i.e. referring old rule 
depending on the date. I would appreciate help to solve this problem .


Thanks in advance.

Swapnil Sawant


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