Final Fantasy Hacktics

I know that in playstation version there is a map debug code to enable a battle selector below "Options", in which you can select two parties to fight eachother. However in psp version the battle selector doesn't seem to work right, though: whenever the battle starts it always tells me Game Over and I get sent back to the map. Can anyone have a patch to fix that problem? Any reply is appreciate.
The CWCheat map debug code of psp version is
_L 0xD02A528C 0x20000000
_L 0x002A528C 0x00000006