Questions on making a unit German.

[Zgok]

Hello fellow Captains and Kaleun's, I am trying to make Peabody's Fuso usable for German quick missions, and if possible, the war patrols or even the Campaign. However, in the IJN_fuso.upc file located in the Submarine folder, I change the ship's nationality to "German" and when I load the game, the ship is still only playable on the American faction. Is there another step i should make? Any input, or answers would be tremendously appreciated.