How to reference/store a joined primary key?

I have a program that imports data from a CSV file into the database using Prisma. In the Excel the rows have something similar to an ID, a category and other non-important stuff. Since the ID is not unique in this CSV, I created a joined primary key in my schema file (

@@id([category, id])

@@id([category, id])

@@id([category, id])

@@id([category, id])).

Is there any way I can reference this joined primary key in a relation?

E.g.:

model FirstEntity {
  id        Int
  category  String
  relations Relation[]

  @@id([category, id])
}

model Relation {
  id         Int         @id @default(autoincrement())
  relationId String
  relation   FirstEntity @relation(fields: [relatesToId], references: [category, id])
}

model FirstEntity {
  id        Int
  category  String
  relations Relation[]

  @@id([category, id])
}

model Relation {
  id         Int         @id @default(autoincrement())
  relationId String
  relation   FirstEntity @relation(fields: [relatesToId], references: [category, id])
}

model FirstEntity {
  id        Int
  category  String
  relations Relation[]

  @@id([category, id])
}

model Relation {
  id         Int         @id @default(autoincrement())
  relationId String
  relation   FirstEntity @relation(fields: [relatesToId], references: [category, id])
}

model FirstEntity {
  id        Int
  category  String
  relations Relation[]

  @@id([category, id])
}

model Relation {
  id         Int         @id @default(autoincrement())
  relationId String
  relation   FirstEntity @relation(fields: [relatesToId], references: [category, id])
}

How to reference/store a joined primary key?

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