One should note that, however, subject to the fact that when the CISG applies by law it can supersede otherwise applicable domestic law to the contrary; when the CISG applies solely by contract, it acts somewhat like a set of terms and conditions incorporated in the contract -- in other words, in this situation it does not supersede mandatory provisions of the applicable domestic law where that law does not so permit.
　　　　
　
　1.2.2 UNIDROIT Principles
　
　The regime covering the greatest geographical scope among the studied instruments is the UNIDROIT Principles resulted from the work of the International Institute for the Unification of Private Law (UNIDROIT), which was set up in 1929 as an auxiliary organ of the League of Nations and whose primary task was to draft a uniform sales law which aimed to combat the problems of trading goods across different jurisdictions.
　　　　 The UNIDROIT Principles do not apply to domestic contracts and are intended to operate globally, which are broader in scope and more detailed in provisions than the CISG.
　
　Because the UNIDROIT Principles are not in the form of a convention or a model law, they do not have a binding effect. They will be applied in practice only because of their persuasive character. According to the Preamble, application of the UNIDROIT Principles to international commercial contracts in four different contexts is possible: (a) Where the parties agree that their contract shall be governed by the UNIDROIT Principles, the Principles are undoubtedly applicable because they are incorporated into the contract like any other contractual clause. Here, the principles will bind the parties only to the extent that they do not contradict mandatory rules of the applicable law. (b) The Principles may also apply when the parties have agreed that their contract be governed by "general principles of law" or the lex mercatoria. (c) The Principles may also be of relevance if the contract is governed by a particular domestic law, even though the application of the Principles is not provided for in the contract. This is the case, whenever dealing with a specific issue, it proves impossible to establish the relevant rule of that particular domestic law and a solution can be found in the Principles. Recourse to the Principles, however, as a substitute for otherwise applicable domestic law is a last resort. (d) The Principles may further serve as instruments for the interpretation and filling the gap of international uniform law. The main idea is to preclude an easy resort to the domestic law indicated by the conflict of laws rule by the forum. In conclusion, it can be said that the UNIDROIT Principles apply only if incorporated into the contract, or if they find enough favour with an arbitrator or judge looking for a rule to fill a gap encountered in the regulation of a given international commercial contract.
　　　　
　
　A stated purpose as suggested in the Preamble is to be stressed: "They may be used to interpret or supplement international uniform law instruments". In practice the question is particularly relevant in the context of the CISG, Art. 7 of which expressly states that "
　　　　 n the interpretation of this Convention regard is to be had to its international character and to the need to promote uniformity in its application" and that "
　　　　 uestions concerning matters governed by this Convention which are not expressly settled it are to be settled in conformity with the general principles on which it is based". In this respect, Bonell, one of the principal architects of the Principles has stated: "The answers given are sharply divided. On the one hand there are those who categorically deny that the UNIDROIT Principles can be used to interpret or supplement the CISG, invoking the rather formalistic and not necessarily convincing argument that the UNIDROIT Principles were adopted later in time than the CISG and therefore cannot be of any relevance to the latter. On the other hand there are those who, perhaps too enthusiastically, justify the use of the UNIDROIT Principles for this purpose on the mere ground that they are ''general principles of international commercial contracts''. The correct solution would appear to lie between these two extreme positions. In other words, there can be little doubt that in general the UNIDROIT Principles may well be used to interpret or supplement even pre-existing international instruments such as the CISG; on the other hand in order for individual provisions to be used to fill gaps in the CISG, they must be the expression of general principles also underlying the CISG."

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