Agreement on cooperation made between PT. Dumai Bersemai Port (BUMD) with PT. Tiga Bersaudara Port has fulfilled the legal requirements of an agreement as stipulated in Article 1320 of the Civil Code. But over time, this agreement has become null and void, because the second party is PT. Dumai Bersemai Port canceled the agreement, and unilaterally decided the agreement, this happened because PT…