Problem occurring in @relation part when generating schema.prisma

[kotaitos]

If the @relation part in the .prisma file is changed as follows, a syntax error occurs in @relation in the generated schema.prisma.

• sample.prisma
  before↓

model Sample {
  ...
  employee        Employee   @relation(fields: [employee_id], references: [id])
  employee_id     Int
  ...
}

after↓

model Sample {
  ...
  employee        Employee   @relation(fields: [employee_id], references: [id], onDelete: Cascade)
  employee_id     Int
  ...
}

• schema.prisma

model Employee_Assignment {
  ...
  employee        Employee   @relation(fields: [employee_id], references: [id]) @relation(fields: [employee_id], references: [id], onDelete: Cascade)
  employee_id     Int
  ...
}

Error

Error: Schema validation error - Error (query-engine-node-api library)
Error code: P1012
error: Attribute "@relation" can only be defined once.
  -->  schema.prisma:103
   | 
103 |   employee        Employee   @relation(fields: [employee_id], references: [id]) @relation(fields: [employee_id], references: [id], onDelete: Cascade)
   | 
error: Attribute "@relation" can only be defined once.
  -->  schema.prisma:103
   | 
103 |   employee        Employee   @relation(fields: [employee_id], references: [id]) @relation(fields: [employee_id], references: [id], onDelete: Cascade)
   | 

Validation Error Count: 2
[Context: getDmmf]