This article concerns the problem associated with the nature of the institution of a petition for reconsideration of the case in view of regulation No 16 of the Administrative Procedur Code in the version before the amendment dated 3 December 2010, which entered into force on 11 April 2011. Despite the amendment, to this day the provision is the source of many disputes, which is reflected in a very non-uniform judicial practice. On the basis of this regulation can be observed, how defective constructed legal provisions affect the administration of justice and the application of the law by creating situations in which the courts take over the functions of law making. On the selected example is shown, how one decision of the Supreme Court, being the basis of decisions of courts of appeal, causes that victims defective administrative decision are charged with the responsibility for legislative errors. Knowledge of the matter, which is the subject of this publication, is extremely important for all practitioners as well as theorists of the law because of the importance of the issues, which accompany the main theme. The work is based on an analysis of the concept of finality and validity of administration decision and depth on theoretical consideration and extensive discussion of the judicial practice of administrative courts, civil courts and Constitutional Tribunal.