Adriano,
The website
www.volksbund.de gives as location Brandenburg for Hptm Erhard Peters on 20.2.1944.
This may point to both the town with that name (Brandenburg-an-der-Havel) or the state (Land) that encircles Berlin.
He's buried at the Werder (Havel) Neuer Friedhof, which may indicate that Peters indeed was killed in action somewhat west of Berlin.
Regards,
Leendert