Germany rejected the Polish government's push for World War II reparations, saying that Berlin had closed the issue for further discussion.
Poland estimates its World War II losses caused by Germany at 6.2 trillion zlotys ($1.40 trillion) and has demanded reparations, but Berlin has repeatedly said all financial claims related to the war have been settled.
"According to the German government, the matter of reparations and compensation for war losses remains closed, and the German government does not intend to enter into negotiations on this matter," the foreign ministry said in a statement.
"The government of the Republic of Poland will continue its efforts to settle debts resulting from German aggression and occupation in the years 1939-1945."
Some six million Poles, including three million Polish Jews, were killed during the war, and Warsaw was razed to the ground following a 1944 uprising in which about 200,000 civilians died.
In 1953, Poland's then-communist rulers relinquished all claims to war reparations under pressure from the Soviet Union, which wanted to free East Germany, also a Soviet satellite, from any liabilities.
Poland's ruling nationalist Law and Justice (PiS) party says that the agreement is invalid because Poland was unable to negotiate fair compensation. It has revived calls for compensation since it took power in 2015 and has made the promotion of Poland's wartime victimhood a central plank of its appeal to nationalism.
The combative stance toward Germany, often used by PiS to mobilize its constituency, has strained relations with Berlin.
There was no immediate confirmation of the diplomatic exchange by Germany.
