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The field Compilation Mother Release exists to connect the release of the compilation to its child releases under the individual games. It shall be filled when creating the child releases. We'll see if there's a better technical way to do this.
The field Compilation Case Description is an optional way to explain special compilation cases. Exemplary, it could be used to describe how to play the game Maniac Mansion from within Day of the Tentacle. This field shall be filled in with the mother release.
The fields P Credits identical with and C Credits identical with shall contain the IDs of releases that already have exactly the same credits (persons and companies) assigned to them as the current release. This is especially true for developer credits that are taken from in-game screenshots.