Abstract
There is no doubt that the principles of awarding public contracts play an important role, especially from the point of view of the stability of regulations and the protection of competition, efficiency and security of transactions. These principles should therefore be applied directly in the pending proceedings. A violation of any of the principles enables the Contractor to indicate this violation by appropriately structuring the allegation in appeal proceedings. According to the jurisprudence of the National Appeals Chamber, the most common complaint raised by Contractors in connection with the principles of awarding public contracts is the infringement of the principle of fair competition and the equal treatment of Contractors. It should be emphasised that such an allegation, or any allegation of a significant violation of any principle of awarding public contracts that affects the course of proceedings, despite the varying jurisprudence of the National Appeals Chamber, may constitute a standalone allegation of violation of the provisions of the Public Procurement Law due to its importance.