Does attribute and action order matter? and Upsert fields?

defmodule MyApp.MyContext.Event do
  use Ash.Resource, data_layer: AshPostgres.DataLayer

  postgres do
    table "event"
    repo MyApp.MyContext.Repo
  end
  
  multitenancy do
    strategy :attribute
    attribute :organization_id
  end

  attributes do
    # Tenancy, Identity and Immutability
    # * Primary Key - [:organization_id, :id]
    # * need to manually declare id so we do not autogenerate UUID
    attribute :organization_id, :uuid, allow_nil?: false, primary_key?: true
    attribute :id, :uuid, allow_nil?: false, primary_key?: true

    attribute :data, :map
    attribute :dataschema, :string
    
    attribute :partitionkey, :string
    attribute :sequence, :integer
    attribute :source, :string, allow_nil?: false
    attribute :subject, :string
    attribute :time, :utc_datetime_usec
    attribute :type, :string, allow_nil?: false

    create_timestamp :created_at
  end

  identities do
    identity :id, [:id]
  end

  actions do
    defaults [:read]
    create :add do
      upsert? true
      upsert_identity :id
      upsert_fields([:id])
    end
  end
end

MyApp.MyContext.Event |>
  Ash.Changeset.for_create(
    :add,
    %{
      organization_id: "1c8345b3-f484-47a7-ad21-da17fa511966",
      id: "a325ac4a-5c7b-11ee-8c99-0242ac120002",
      type: "namtest2",
      source: "MyEventSource.34293942394234"
    })
  |> Ash.Changeset.set_tenant("1c8345b3-f484-47a7-ad21-da17fa511966")
  |> MyApp.MyContext.create()