Shouldn't catalog numbers of bundled and promo soundtracks be N/A if no catalog number is indicated in the soundtrack's liner notes, the actual disc, etc. or found on the web? I know an explanation for using the game's catalog number for this soundtrack has already been mentioned in the notes, but is this how these types of soundtracks should be cataloged?
I noticed some bundled soundtracks, including this one, cataloged with SLPM-, but
SLPM is generally used for Japanese Playstation games. A separate database for game discs already exists at
redump.org, and I can see there being some confusion when the same catalog number is used for two entirely different but related things (games and vgm).