PrestaShop/PrestaShop — pull request #48 by doekia (2012-11-26 13:33:00+00:00)
Title: [+] BO: Allow override loadUpgradeVersionList() 

Sorry for this second time pull request for the reason I had to recreate my entire fork. (my bad)
The initial pull and comment are here: https://github.com/PrestaShop/PrestaShop/pull/33#issuecomment-10708105

I guess you have misunderstood the purpose of this change because you confuse the override world with the meaning it has in Prestashop.
Let rephrase that.

Allow a module to return a different upgradeVersionList than the base module implementation.

Does it make more sense?