Java Hibernate映射Grails异常。如何正确地映射这一点？

我试图理解当外部对象具有复合id时如何映射外键

class Sector {

  int sectorId

  static belongsTo = [ company: Company ]

  static mapping = {
    id composite: ['company','sectorId']
    company(column: 'company_id')
    table 'sectors'
  }

}

class Overtime {
  java.util.Date date
  static belongsTo = [ sector: Sector, employee: Employee ]
  static mapping = {
    id composite: ['date','employee']
    sector(column:['sector_id','company_id'])
  }
}

class Employee {
  long employeeId
  String name
  //...
  static mapping = {
    table 'employees'
    version false
    id column: 'employee_id', name: 'employeeId'
  }

  static hasMany = [ overtimes : Overtime ]

}

class Company {
  String companyCode
  String companyName

  static mapping = {
    version false
    table 'companies'
    id column: 'company_id',name: 'companyCode'
  }

  static hasMany = [sectors : Sector]

}

但是这个映射给了我一个错误：

.hibernate.MappingException: Foreign key (FK9E82D8D2219D889E:overtime [sector_id, company_id,sectors_sector_id,sectors_sector_id])) must have same number of columns as the referenced primary key (sectors[company_id,sector_id])

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我缺少什么？

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