Art. 4 CISG
This Convention governs only the formation of the contract of sale and the rights and obligations of the seller and the buyer arising from such a contract. In particular, except as otherwise expressly provided in this Convention, it is not concerned with:
(a) the validity of the contract or of any of its provisions or of any usage;
(b) the effect which the contract may have on the property in the goods sold.
The Secretariat Commentary on Art. 4 of the 1978 New York Draft, predecessor to Art. 4 CISG, gives insight into the drafters' unterstanding on the eve of the 1980 Vienna Diplomatic Conference.
CISG-AC Opinion regarding Art. 4 CISG
CISG-AC Opinion No. 10 ‘Agreed Sums Payable upon Breach of an Obligation in CISG Contracts’ (Rapporteur: Pascal Hachem), adopted by the CISG Advisory Council following its 16th meeting in Wellington (New Zealand) on 3 August 2012
Overview of case law on Art. 4 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.