The problem with the status of these territories was that the Potsdam Agreement was not a legally binding treaty, but a memorandum between the USSR, the US and the UK. It regulated the issue of the eastern German border, which was to be the Oder–Neisse line, but the final article of the memorandum said that the final decisions concerning Germany were subject to a separate peace treaty; at which the three Allied signatories committed themselves to respect the terms of the memorandum. Hence, so long as the four Allied Powers remained committed to the Potsdam protocols, without German agreement to the Oder–Neisse line boundary there could be no Peace Treaty and no German Reunification.