In which document was the exact course of the northern part of the German-Polish border decided?

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The answer is apparently: this border isn't defined anywhere. As you correctly noted, the result of the Potsdam Conference was the Oder-Neiße-line as Poland's western border, without any exception for Stettin. The sources that I looked at agree that the Soviet Union violated that agreement and gave the area around Stettin to Poland in July 1945. It is unclear what prompted this decision, I couldn't find anything in the Russian sources. Most likely this was simply additional compensation for the territories Poland lost to the Soviet Union. Neither could I find any reaction from the other allies - it seems that they didn't consider the matter important enough.

There is lots on this in the German sources however. In particular, there is a documented parliamentary debate in West Germany following the Treaty of Warsaw in 1970. I will try to give a rough translation:

Member of parliament Rollmann asks:

1) Which west border Poland's did the German government accept in the Treaty of Warsaw, the Oder-Neiße-line as defined by the Potsdam Conference or the additionally changed to German disadvantage Pseudo-Oder-Neiße-line?

2) When the German government was discussing the Warsaw Treaty, did it overlook that contradictory to the decision of the Potsdam conference a large area around Stettin to the west of Oder was put under Polish administration?

Answer from state secretary Moersch:

1) The German government didn't define any borders in the Warsaw Treaty, it didn't have any possibility to do that. It merely accepted that the already existing border is the western border of Poland. Changing the current border line was not possible.

2) The German government didn't overlook it. However, we had to base our decision on two undeniable facts: the decisions of the Postdam Conference and the existing border. Germany cannot change anything on either these decisions or the existing border.

Poland was worried that Germany would again discuss this border after reunification. So the Treaty on the Final Settlement with Respect to Germany from 1990-09-12 once again states explicitly that Germany recognizes its existing border to Poland (German text of the treaty, see Artikel 1, (2)). But even this treaty doesn't describe the border - it simply refers to the existing border because at that point this border was simply a fact.

Edit: There was apparently a document defining this border after all. According to the information published by the German government on 1990-06-22 (stated again here) the base for the German-Polish border would be the The Treaty of Zgorzelec of 1950-07-06. Article 5 of this treaty required the creation of a document describing the exact border line. That document was signed by the government of the German Democratic Republic on 1951-01-27 (Akt über die Ausführung der Markierung der Staatsgrenze zwischen Deutschland und Polen).

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