I thought it had to be some more complicated solution, so before i could read your message i tried something with ftp:
i made a backup copy of the folder BLES01059 (FIFA11) that is located in /dev_hdd0/game/BLES01059 and then i deleted it from the ps3 hdd.
The game started again and worked good. After that i took a look again in the ftp and i saw the deleted folder was again there but empty. When the older folder had some files with a subfolder too containing a eboot.bin file too. I dont have a clue of what technically happened...
Anyway now i re-uploaded the folder with all the files and deleted the gamedata in the xmb (appeared corrupted).
The game works good too.
My question now is: what is the use of that folder(s) inside /dev_hdd0/game/ ? (I deleted it and the game worked anyway..)