If a buyer refuses non-compliant goods, the UCC generally gives the seller the opportunity to correct the error (the „right to cure“). This only applies if the initial time for the seller to complete the order has not expired, if the seller informs the buyer within a reasonable time of his intention to heal and the seller completes the corrected delivery in a timely manner for the completion of the initial delivery date.  The authors of the UCC faced an additional difficulty resulting from the requirements for the creation of a sales contract. UCC Section 2-201, in its pre-2003 version, required that a sales contract of more than $500 be written. The replacement of a letter was available under the provision and it was not necessary for the entire contract to be available in writing, but the basic writing requirement or one of the substitutes cited was imperative. Therefore, Section 2-209 (3) required that the document request be completed if the sales contract as amended is consistent with the provisions of Section 2-201. One of the first items on the CNUDCI agenda, when it was first merged in 1968, was whether ULIS and the Single Education Act would be adopted in general. When it turned out that there were many objections to both, UNCITRAL began to determine the changes in the two uniform laws that would be necessary to make them universally acceptable. UNCITRAL began to watch ULIS. When the work of the Working Group on International Goods Purchases was completed in 1976, it was decided that the revisions were sufficiently important for the revised text to be presented in the form of a new agreement to replace ULIS. Work then began to examine [page 52] changes to the Training Act.
It was considered that it was also a convention and not a uniform law attached to a convention. None of the written texts of the amendment or termination of contracts by agreement were discussed in any of the written texts. The principles of UNIDROIT Article 2.1.18 have the same rule, with the exception of the share that relates to non-dealers. Although uniDROIT`s principles have no scope, the preamble states that they are intended only for international trade agreements. Considering the definition of „contract“ and official observations of the „agreement,“ it is specified that an agreement must not comply with the requirements of a contract and may or may not have legal consequences.