diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index f1772115..9f7be213 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -78,6 +78,7 @@ module ApplicationHelper
     {
       class: "form-control #{invalid(metadata.post, attribute)} #{extra[:class]}",
       required: required,
+      disabled: metadata.disabled?,
       autofocus: (metadata.post.attributes.first == attribute),
       aria: {
         describedby: id_for_help(attribute),
diff --git a/app/models/metadata_template.rb b/app/models/metadata_template.rb
index c8ac0df7..49e432c6 100644
--- a/app/models/metadata_template.rb
+++ b/app/models/metadata_template.rb
@@ -148,6 +148,21 @@ MetadataTemplate = Struct.new(:site, :document, :name, :label, :type,
     layout.metadata.dig(name, 'private').present?
   end
 
+  # Determina si el campo debería estar deshabilitado
+  def disabled?
+    layout.metadata.dig(name, 'disabled') || !writable?
+  end
+
+  # Determina si el campo es de solo lectura
+  #
+  # once => el campo solo se puede modificar si estaba vacío
+  def writable?
+    case layout.metadata.dig(name, 'writable')
+    when 'once' then value.blank?
+    else true
+    end
+  end
+
   private
 
   # Si es obligatorio no puede estar vacío
diff --git a/app/models/post.rb b/app/models/post.rb
index cb637f93..d0253a71 100644
--- a/app/models/post.rb
+++ b/app/models/post.rb
@@ -379,7 +379,7 @@ class Post
   # Ejecuta la acción de guardado en cada atributo.
   def save_attributes!
     attributes.map do |attr|
-      self[attr].save
+      self[attr].writable? && self[attr].save
     end.all?
   end
 end