Have you tried using the accumulate function?
//taken from the link below and modified a bit to use count.. (it is
untested)
rule "Count the number of items in the order"
when
$order : Order()
$total : Number( )
from accumulate( OrderItem( order == $order), count( ) )
then
System.out.println("There are "+$total+ " number of items in the order");
end
http://docs.redhat.com/docs/en-US/JBoss_Enterprise_SOA_Platform/4.3/html/JBoss_Rules_Reference_Guide/ch05s05s02s10.html
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