[OFBiz] Users - Promotions

[Manuel Meyer]

Hi all!

I am trying to use the promotion, but cannot find the right way to use them
for my peculiar problem.

I have a product ref. ABCDE, and I would like to create a promotion code
that, when entered, set 1 ABCDE to price 0.

I've defined the following:
Condition:
when X quantity of product is 1 
Condition product include ABCDE
Action: 
X product for price Y Quantity 1 amount 0
action product include ABCDE


If I add 2 ABCDE in my cart, the code set 1 to price 0, but if I add only 1,
the code does nothing. 
I've spend a couple of hours looking at the code, and I have the impression
that the same product cannot be chosen as condition and action.
Or maybe I am not using the right promotion condition/action but I really do
not see what else to use.

Any idea?
Thanks a lot for your answers,
Manuel