In the FRG at the time this treaty signed it was not seen as the last word on the border , because article IV stated that previous treaties like the Potsdam Agreement were not superseded by this latest agreement , so the provisions of this treaty could be changed by a final peace treaty between Germany and the Allies of World War II as provided for in the Potsdam Agreement . At the time the treaty was signed , it was not seen as the last word on the Polish border in West Germany , because Article IV of this treaty stated that previous treaties like the Potsdam Agreement were not superseded by this latest agreement , so the provisions of this treaty could be changed by a final peace treaty between Germany and the Allies of World War II - as provided for in the Potsdam Agreement .