Pokemon Mystery Dungeon Team Red does not save

[Schattenruf]

Hi there,

just a quick question if Pokemon Mystery Dungeon does some problems on gpsp.

game_name: POKE DUNGEON
game_code: B24P
vendor_code: 01

I changed the game_config file to the Code above but it always states "save failed".
If I go to the menu and say "save on exit" it will create a .sav but with 64kb size.

Is there any fix?