About Shining Force III

Why I cannot add a new game, always I get error "you cannot edit existing games.."

Here, add Shining Force 3 Premium Disc for Sega Saturn (strategy, japanese only, Raster/Polygon)

http://www.shiningforcecentral.com
http://www.shinforce.com/elite/shiningforce/index.htm
http://www.camelot.co.jp/force3/
http://www.sega-saturn.com/saturn/shining3.htm
http://sf3.zophar.net/

rpgfans.com say:
Shining Force III is a game that has managed to attract a large amount of attention ever since it was announced for the Sega Saturn. Not only has it turned out to be one of the greatest strategy-RPGs ever created, it was one of very few games that was released in successive multiple chapters (SFIII was released in three interconnected scenarios roughly 6 months apart). To add fuel to the fire, Sega of Japan announced that a special gift would be sent to everyone who had bought all three scenarios of SFIII. This gift turned out to be the fantastic Shining Force III Premium Disc.