Query for applying constraints?

Question

Requirement
To search for the products whose SKU's start date is less than today and end date is greater than today.
Pre-Condition
•     In our Project indexing is at product level
•     Start Date and End Date is at Child SKU level.
Problem
In XHTML, for a product start date and end date is indexed for each SKU, resulting in 'n' number of start dates and 'n' number of end dates for the product.
Now, if we give a constraint for start date and end date then, search compares any of the 'n' start date indexed for the product with the constraint and any of the 'n' end date indexed for the products. Because of this issue extra products are returned and filtering is not correct.
For Example
I have two products
DATA
Product 1 with two child SKUs and following are its start date and end Date:
All of these values are indexed in XHTML for Product 1.
Product 1
Child SKU1 - Start date: 20-Feb-2011
End date: 25-Jun-2011
Child SKU2 - Start date: 20-Jul-2011
End date: 20-Aug-2011
Product 2 with two child SKUs and following are its start date and end Date:
All of these values are indexed in XHTML for Product 2.
Product 2
Child SKU1 - Start date: 20-Feb-2011
End date: 25-Aug-2011
Child SKU2 - Start date: 20-Jul-2011
End date: 20-Aug-2011
CONSTRAINTS
Following constraints are passed to search:
start date < 29th Jun 2011
and
End date > 29th Jun 2011
RESULTS
Following results are coming from search,
Product 1,Product 2
Product 2 is fine but Product 1 should not have come as the result.
Search is comparing start date of first child sku of Product 1 and end date of second child SKU of Product 1 because of which wrong product is getting returned.
Query: Is there some way while indexing or applying constraint where I can specify that ATG Search should compare values for each child SKU and not all together.
Regards,
Isha

Answer 1

Did you try writing an indexedItemsGroup - rules to filter it before doing an index.
Thanks,
Renji