How to insert facts in a sroted list via rules in RHDM/BRMS

Issue

• I have a FactA with a list of FactB objects. I have a requirement to read the FactB objects sorted by a FactB's property (e.g. dueDate). So I write a rule below:

rule "Insert FactB"
when
    $a: FactA()
    $b: FactB() from $a.factBList   
then
    insert($b);
end

But the inserted order doesn't meet the sorted order of factBList. How can I achieve it?