Currently even though regional regulations contravvene certain provisions or aspects of existing laws and the presidential governmental system, they remain valid unless canccelled by the Supreme Court pursuant to the preasumptio iustae causa principle thereby allowing the ex nunc validity of such regultios. this acticle addresses the legal issues concerning the annulment of regionals and finds that the process may indeed be inconsistent with existing laws and the presidential goverment system. thus there is a nee to clarify (a) the scope of Article 145, paragraph (3) of law No. 32vyear of 2004 upon regional goverment, particularly since regional regulations are a form of "delegated legislation," (b) the standartd or threshold of " contravention of law" by which they may be annulled, and (c) the legal effects of annulment in order to crete legal certainty.