Case concerning certain German interest in Polish Upper Silesia (Merits) PCIJ, Ser A, No. 7, p. 19

Poland complained of certain transaction of the German Government regarding the latter´s property in Upper Silesia as being in violation of the signed, but yet unratified, Treaty of Versailles (Art. 256, I, II)

From the standpoint of International Law and the Court which is its organ, municipal laws are merely facts which express the will and constitute the activities of States, in the same manner as do legal decisions or administrative measures