diff --git a/lib/api/decorators/schema.rb b/lib/api/decorators/schema.rb
index a50050c509..d2a17b2958 100644
--- a/lib/api/decorators/schema.rb
+++ b/lib/api/decorators/schema.rb
@@ -35,7 +35,7 @@ module API
                    type:,
                    name_source: property,
                    required: true,
-                   writable: true,
+                   writable: -> { represented.writable?(property) },
                    min_length: nil,
                    max_length: nil,
                    regular_expression: nil,
diff --git a/lib/api/v3/work_packages/schema/work_package_schema.rb b/lib/api/v3/work_packages/schema/work_package_schema.rb
index a5a5a45f04..a0dedf88cb 100644
--- a/lib/api/v3/work_packages/schema/work_package_schema.rb
+++ b/lib/api/v3/work_packages/schema/work_package_schema.rb
@@ -84,23 +84,39 @@ module API
             project.all_work_package_custom_fields.to_a & type.custom_fields.to_a
           end
 
-          def percentage_done_writable?
-            if Setting.work_package_done_ratio == 'status' ||
-               Setting.work_package_done_ratio == 'disabled'
-              return false
+          def writable?(property)
+            case property
+            when :percentage_done
+              percentage_done_writable?
+            when :estimated_time, :start_date, :due_date
+              nil_or_leaf?(@work_package)
+            else
+              writable_properties.include? property
             end
-            nil_or_leaf?(@work_package)
-          end
-
-          def estimated_time_writable?
-            nil_or_leaf?(@work_package)
           end
 
-          def start_date_writable?
-            nil_or_leaf?(@work_package)
+          private
+
+          def writable_properties
+            [
+              :subject,
+              :description,
+              :estimated_time,
+              :assignee,
+              :responsible,
+              :type,
+              :status,
+              :category,
+              :version,
+              :priority
+            ]
           end
 
-          def due_date_writable?
+          def percentage_done_writable?
+            if Setting.work_package_done_ratio == 'status' ||
+               Setting.work_package_done_ratio == 'disabled'
+              return false
+            end
             nil_or_leaf?(@work_package)
           end
 
diff --git a/lib/api/v3/work_packages/schema/work_package_schema_representer.rb b/lib/api/v3/work_packages/schema/work_package_schema_representer.rb
index 8368a4a1df..6897639d72 100644
--- a/lib/api/v3/work_packages/schema/work_package_schema_representer.rb
+++ b/lib/api/v3/work_packages/schema/work_package_schema_representer.rb
@@ -60,12 +60,10 @@ module API
 
           schema :lock_version,
                  type: 'Integer',
-                 name_source: -> (*) { I18n.t('api_v3.attributes.lock_version') },
-                 writable: false
+                 name_source: -> (*) { I18n.t('api_v3.attributes.lock_version') }
 
           schema :id,
-                 type: 'Integer',
-                 writable: false
+                 type: 'Integer'
 
           schema :subject,
                  type: 'String',
@@ -77,22 +75,18 @@ module API
 
           schema :start_date,
                  type: 'Date',
-                 required: false,
-                 writable: -> { represented.start_date_writable? }
+                 required: false
 
           schema :due_date,
                  type: 'Date',
-                 required: false,
-                 writable: -> { represented.due_date_writable? }
+                 required: false
 
           schema :estimated_time,
                  type: 'Duration',
-                 required: false,
-                 writable: -> { represented.estimated_time_writable? }
+                 required: false
 
           schema :spent_time,
                  type: 'Duration',
-                 writable: false,
                  show_if: -> (_) do
                    current_user_allowed_to(:view_time_entries, context: represented.project)
                  end
@@ -100,24 +94,19 @@ module API
           schema :percentage_done,
                  type: 'Integer',
                  name_source: :done_ratio,
-                 writable: -> { represented.percentage_done_writable? },
                  show_if: -> (*) { Setting.work_package_done_ratio != 'disabled' }
 
           schema :created_at,
-                 type: 'DateTime',
-                 writable: false
+                 type: 'DateTime'
 
           schema :updated_at,
-                 type: 'DateTime',
-                 writable: false
+                 type: 'DateTime'
 
           schema :author,
-                 type: 'User',
-                 writable: false
+                 type: 'User'
 
           schema :project,
-                 type: 'Project',
-                 writable: false
+                 type: 'Project'
 
           schema_with_allowed_link :assignee,
                                    type: 'User',