diff --git a/lib/decentralised_book_index/metadata/author_alias_registry.ex b/lib/decentralised_book_index/metadata/author_alias_registry.ex
index 4e254b6..84149f7 100644
--- a/lib/decentralised_book_index/metadata/author_alias_registry.ex
+++ b/lib/decentralised_book_index/metadata/author_alias_registry.ex
@@ -15,19 +15,11 @@ defmodule DecentralisedBookIndex.Metadata.AuthorAliasRegistry do
     defaults [:read, :create, :update, :destroy]
 
     create :sync_create do
-      accept [:id]
-
-      argument :dbi_server_id, :uuid do
-        allow_nil? false
-      end
+      accept [:id, :dbi_server_id]
     end
 
     update :sync do
-      accept [:id]
-
-      argument :dbi_server_id, :uuid do
-        allow_nil? false
-      end
+      accept [:id, :dbi_server_id]
     end
 
     read :by_id do
diff --git a/lib/decentralised_book_index/sync/sync/author_alias_registry_sync.ex b/lib/decentralised_book_index/sync/sync/author_alias_registry_sync.ex
index 8fec777..9db52e5 100644
--- a/lib/decentralised_book_index/sync/sync/author_alias_registry_sync.ex
+++ b/lib/decentralised_book_index/sync/sync/author_alias_registry_sync.ex
@@ -4,13 +4,13 @@ defmodule DecentralisedBookIndex.Sync.AuthorAliasRegistrySync do
 
   def create_update(attrs, server_id) do
     case Metadata.get_author_alias_registry_by_id(attrs.id) do
-      {:ok, author} ->
+      {:ok, alias_registry} ->
         attrs =
           attrs
           |> Map.delete(:id)
           |> Map.put(:dbi_server_id, server_id)
 
-        author
+        alias_registry
         |> Ash.Changeset.for_update(:sync, attrs)
         |> Ash.update!()
 
diff --git a/test/decentralised_book_index/sync/sync/author_alias_registry_sync_test.exs b/test/decentralised_book_index/sync/sync/author_alias_registry_sync_test.exs
index 3c27322..a479cb8 100644
--- a/test/decentralised_book_index/sync/sync/author_alias_registry_sync_test.exs
+++ b/test/decentralised_book_index/sync/sync/author_alias_registry_sync_test.exs
@@ -16,7 +16,7 @@ defmodule DecentralisedBookIndex.Sync.DataTransformers.AuthorAliasRegistrySyncTe
       }
 
       assert :ok = AuthorAliasRegistrySync.create_update(attrs, server.id)
-      assert {:ok, saved_alias} = Metadata.get_author_by_id(attrs.id)
+      assert {:ok, saved_alias} = Metadata.get_author_alias_registry_by_id(attrs.id)
       assert server.id == saved_alias.dbi_server_id
     end
 
@@ -30,7 +30,7 @@ defmodule DecentralisedBookIndex.Sync.DataTransformers.AuthorAliasRegistrySyncTe
       }
 
       assert :ok = AuthorAliasRegistrySync.create_update(attrs, server.id)
-      assert {:ok, saved_alias} = Metadata.get_author_by_id(attrs.id)
+      assert {:ok, saved_alias} = Metadata.get_author_alias_registry_by_id(attrs.id)
       assert server.id == saved_alias.dbi_server_id
     end
   end