Use @ItemParam or @ItemParam@1.11.0 to refer to a BCSV file. Enums are stored as integers; add _en or _jp to get strings.
@ItemParam
@ItemParam@1.11.0
_en
_jp
Foreign keys are often done against row number (rowid - 1) rather than UniqueID.
rowid - 1
UniqueID
BCSV Version: 2.0.4