Can I create RDS read replica in another subnet group to same region by RDS API?

create_read_repolica.js

var RDS, params, rds;

RDS = require('aws-sdk').RDS;

rds = new RDS({
  region: 'ap-northeast-1'
});

params = {
  DBInstanceIdentifier: 'db-xxx-002',
  SourceDBInstanceIdentifier: 'db-xxx-001',
  DBInstanceClass: 'db.t2.small',
  DBSubnetGroupName: 'staging'
};

rds.createDBInstanceReadReplica(params, function(err, data) {
  if (err) {
    console.log(err.stack);
    return;
  }
  console.log(data);
});

I got following error

DBSubnetGroupNotAllowedFault: DbSubnetGroupName should not be specified for read replicas that are created in the same region as the master