General principles for making awards

What are the general principles for making awards in German public procurement law?

(German Act against Restraints of Competition  = Gesetz gegen Wettbewerbsbeschränkungen, GWB)

German Act against Restraints of Competition (Gesetz gegen Wettbewerbsbeschränkungen, GWB), Article 97 General Principles for Making Awards Link: https://www.gesetze-im-internet.de/englisch_gwb/englisch_gwb.html#p1076