Discount is a field of Order and must not appear in an Item(...).
Probably you want:
   Order  ( $discount : Discount > 10,...

Also, most likely, all your fields need to be written with a lower case initial letter,
   Order  ( $discount : discount > 10, $items : items)

-W

On Tue, Feb 23, 2010 at 1:11 PM, dhari <sdhari@hotmail.com> wrote:

In this scenario I do have typical Order and Items data structure. I want to
implement various business rules where I want to check both Order attributes
and Item attributes together.

Order [ Date, Discount, Amount, Customer, Type, Items]
Item [ Quantity, Rate, ExpiresDate, Grade ]

I am trying to implements following rules but all gives me syntax error. I
wondering if someone can help me in.


rule “one”
   when
       Order  ( $discount : Discount, $items : Items)
       Item ($discount > 10 && Grade > 3) from $items
   then
       System.err.print(“Discount is not allowed with items having grade 3 or
higher)
end

rule “two”
   when
       Order  ( $discount : Discount, $items : Items)
       Item ($discount  > 20 || Quantity < 5 ) from $items
   then
       //do some thinge
end
--
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