Codebreaker V9 American disc won't play in my pal PS2

Hi all

I have recently bought a cheat disc from America "Codebreaker V9 disc

The disc is for NTSC ps2's but i read that modified ps2's could play the disc .Well it doesn't play in my modified PS2.

I've a messiah 2 mod chip and have played japanese and american games but this disc just won't load.

Any ideas of how i can convert such a disc to pal ? or get it working ?

regards in advance

HM1