[wongarsu]

I think the actual (EU) law is closer to "best suited". You have a number of offers to select from and have to say why you chose that offer. Saying "I chose them because they were the cheapest" is the easiest and safest solution so that's what usually happens, but it's not the only option.

[anticensor]

You have to pre-declare how you choose the best offer. Final procurement order is oftentimes made into existence after many rounds of rejection by procurement overseeing committee.