Dear Caetano,
You will not find many posts from me requesting for solutions/explanation as I know all the SAP forums and SAP help documents carry very rich content and addresses most the issues/concerns.
For sure I have gone through the SAP library page that you have shared. It is just that I am not finding any supporting data snipes(images) on that page. I do not know, whether it is my browser or what but I am not seeing an image which can explain the statement "The most appropriate lot size is 2000 pieces because if further requirements were added to this lot, total storage costs would be larger than the lot size independent costs."
I am definitely missing something.
BR,
Mayur