You really are an impatient student, my dear Mr. Egorka. Unfortunatelly, in this very moment I am pretty unable to finish that previously mentioned large article due to my unalterable professional obligations, nowadays – pretty unexpectedly! – associated with my dearly beloved ex-company, and directly connected with certain chemical processes within sugar beat slurry operated bio-gas rectors. Nevertheless, a direct answer to your enthusiastic question is - no. 
Although obligatory erga omnes legal regulations were codified in the early XVIII century, the machinery of law was actually altered in this manner between 1832 and 1882, and this highly innovative legal improvement was actually introduced under the various Companies Acts, beginning in 1844. Unfortunately, it was not until 1871 that the science of law gave them adequate recognition. However, this completely legal academic evaluation – although highly interesting! - is not important for our case we do have here. What is important for us here is the fact that the regulation erga omnes was formally and unquestionably accepted by the German government before the WW2.
Our modern, sorrowfully unacquainted general populace is completely ignorant about the fact that an professionally brilliant, ethically superb and personally incredibly brave German iurist of the Wehrmacht, Colonel General Helmuth James Count von Moltke, directly claimed in his official memorandum to OKW that the order issued by a great legal genius and democratically elected omnipotent governor of the Reich, Mr. Adolf Hitler, who instructed German soldiers to execute Soviet prisoners of war because the Soviet Union had not signed international conventions protecting prisoners of war, thus refuting their protection under international law - actually was completely illegal.
He was sufficiently convinced and unshakably resolved to emphasize publically the fact that although the Soviets had not signed the Geneva Convention regarding POWs, the Germans had. Completely incredibly, but article No. 82 of the Convention obliged signatories to treat all prisoners, from any state, according to the dictates of humanity, thus providing an excellent example of completely valid obligatory disposition erga omnes.
[i]Art. 82. The provisions of the present Convention shall be respected by the High Contracting Parties in all circumstances.
In time of war if one of the belligerents is not a party to the Convention, its provisions shall, nevertheless, remain binding as between the belligerents who are parties thereto.[/i]
The only thing that allied prosecution in Nuremberg was beholden to prove was the per se inconsistency of the German factual deeds with the general principles of humanity. And that task, my dear Mr. Egorka was an easy one:
Bodies of Soviet prisoners of war
Across the years, one cannot help but admire the personal courage and moral integrity of German military lawyers who openly advised the OKW that numerous Hitler’s edicts were completely illegal, and that Soviet prisoners of war should be handled humanely as a matter of customary international law even though the Soviet Union was not a party to the relevant conventions. Another legal expert, Field Marshal Wilhelm Keitel, called “Nickesel” (“the nodding donkey”) by other colleagues, wrote some highly brainless, nowadays sorrowfully revitalized remarks about the obsolescence of the Geneva rules as resources of the International customary law, but places where those outstanding German lawyers were executed fortunately still are German national memorials today.
In the mantime, my precious young apprentice, as always – all the best! 
