Ustawa z dnia 20 kwietnia 2004 r. o zmianie i uchyleniu niektórych ustaw w związku z uzyskaniem przez Rzeczpospolitą Polską członkostwa w Unii Europejskiej

This legislative act was designed to align Polish national law with the requirements of European Union membership. It involves updating and repealing various existing statutes to ensure legal compatibility with EU standards and institutional frameworks. The changes affected the entire Polish legal system, impacting various sectors and administrative bodies to ensure they functioned in accordance with the new obligations and rights brought by Poland's accession to the EU.