Hello All,

I have a list of Items that I am inserting into working memory. Here is the rule that is failing:

rule "Cannot select X if both Y and Z are not selected"
when
    Item(code == "X")
    (or (not Item(code == "Y"))
        (not Item(code == "Z")))
then
    System.out.println("Error: You cannot select X unless both Y and Z are selected");
end

This rule works correctly when X and Y are there, and when X and Z are there. However, when both Y and Z are missing, the error prints twice. Can anyone tell me what I am doing wrong.

Thanks a lot
Vithal