Art. 78 CISG
If a party fails to pay the price or any other sum that is in arrears, the other party is entitled to interest on it, without prejudice to any claim for damages recoverable under article 74.
The Secretariat Commentary does not adress Article 78 CISG, since there was no equivalent provision in the 1978 New York Draft, which formed the basis for the Secretariat Commentary.
CISG-AC Opinion regarding Art. 78 CISG
Overview of case law on Art. 78 CISG: UNCITRAL Digest
The UNCITRAL Digest on the CISG can be used as a starting point to discover the relevant case law on this article.