[Vuejs]-<V-Model> doesn't work inside <V-Select> and only give no data available

Finally I can solve this, it seems i must computed tipeDocs properly to update my own :items,

computed: {
  tipeDocs() {
    return [
      'Dokumen Usaha Dagang Perantara',
      this.kodePenjualan
    ]
  }
}

I hope this solution can help a lot of people who got stuck at the same problem with me

source : Answer for my question in Vue Forum