What are the material and legal defects that can appear in the sales contract and what rights does the buyer have in that case? Namely, in the daily trade in goods and services, we can see that there are more and more situations in which defects appear, either because the item has some material defect, or because someone is restricting the buyer's rights. For this reason, the legislature regulated the issue. Provisions on material and legal defects are regulated within the chapter of the contract of sale, by the Law on Obligations. The reason why the legislature regulated it in this way is the wide use of the provisions of the sales contract, but this does not mean that these provisions apply only to the sales contract, but to all billing legal transactions. The legislator in the provisions of Art. 401.-437. The ZOO lists the cases of material deficiencies, and very extensively, and cases where there is a material deficiency. It also very precisely determines what rights the customer has in case of defects. What the ZOO also precisely regulates are the deadlines in which the buyer can invoke his rights, these deadlines are exclusive, so in the case of material defects it is a deadline of two years from the notification to the seller that there is a defect, and in the case of legal defects it is a deadline of one year days from the knowledge of the right of the third party. With regard to other deadlines, the ZOO distinguishes consumer contracts from commercial ones, thus it considers traders as professionals and shortens the deadlines for exercising their rights.