diff --git a/src/api/app/controllers/webui/relationships_controller.rb b/src/api/app/controllers/webui/relationships_controller.rb
deleted file mode 100644
index 43fcdd185bd..00000000000
--- a/src/api/app/controllers/webui/relationships_controller.rb
+++ /dev/null
@@ -1,45 +0,0 @@
-class Webui::RelationshipsController < Webui::BaseController
-
-  before_action :load_object
-  before_action :load_target
-  before_action :load_role
-
-  def load_object
-    if login = params[:user]
-      @object = User.get_by_login(login)
-    elsif title = params[:group]
-      @object = Group.get_by_title(title)
-    else
-      raise MissingParameterError, "Neither user nor group given"
-    end
-  end
-
-  def load_target
-    if params[:package_id].blank?
-      @target = Project.get_by_name(params[:project_id])
-    else
-      @target = Package.find_by_project_and_name(params[:project_id], params[:package_id])
-    end
-  end
-
-  def load_role
-    @role = Role.find_by_title!(params[:role]) if params[:role]
-  end
-
-  rescue_from 'ActiveRecord::RecordInvalid' do |exception|
-    render_error status: 400, errorcode: 'change_role_failed', message: exception.record.errors.full_messages.join('\n')
-  end
-
-  def create
-    raise MissingParameterError, "No role is given" unless @role
-    @target.add_role(@object, @role)
-    render json: { status: 'ok' }
-  end
-
-  def remove_user
-    # @role can be nil to remove all roles
-    @target.remove_role(@object, @role)
-    render json: { status: 'ok' }
-  end
-
-end
diff --git a/src/api/config/routes.rb b/src/api/config/routes.rb
index 2ab6f73685d..3b45426f3ff 100644
--- a/src/api/config/routes.rb
+++ b/src/api/config/routes.rb
@@ -337,14 +337,6 @@
           get 'infos'
           get 'status'
         end
-        collection do
-          get 'remotes'
-        end
-        resources :relationships, :only => [:create] do
-          collection do
-            delete :for_user, action: :remove_user
-          end
-        end
         resources :flags, :only => [:index]
         resources :packages, :only => [], constraints: { :id => %r{[^\/]*} } do
           resources :relationships, :only => [:create] do
diff --git a/src/api/webui/app/controllers/webui/project_controller.rb b/src/api/webui/app/controllers/webui/project_controller.rb
index bdd47c19bbf..a70da32d557 100644
--- a/src/api/webui/app/controllers/webui/project_controller.rb
+++ b/src/api/webui/app/controllers/webui/project_controller.rb
@@ -796,19 +796,19 @@ def move_path_down
     redirect_to :action => :repositories, :project => @project
   end
 
-  def change_role_options(params)
-    ret = Hash.new
-    ret[:role] = params[:role] if params.has_key? :role
-    if params.has_key? :userid
-      return ret.merge( { user: params[:userid] })
+  def load_obj
+    if login = params[:userid]
+      return User.get_by_login(login)
+    elsif title = params[:groupid]
+      return ::Group.get_by_title(title)
     else
-      return ret.merge( { group: params[:groupid] })
+      raise MissingParameterError, "Neither user nor group given"
     end
   end
 
   def save_person
     begin
-      ApiDetails.create(:project_relationships, @project.name, change_role_options(params))
+      @project.api_project.add_role(load_obj, Role.find_by_title!(params[:role]))
       @project.free_cache
     rescue ApiDetails::TransportError, ApiDetails::NotFoundError, User::NotFound => e
       flash[:error] = e.to_s
@@ -826,7 +826,7 @@ def save_person
 
   def save_group
     begin
-      ApiDetails.create :project_relationships, @project.name, change_role_options(params)
+      @project.api_project.add_role(load_obj, Role.find_by_title!(params[:role]))
       @project.free_cache
     rescue ApiDetails::TransportError, ApiDetails::NotFoundError, ::Group::NotFound => e
       flash[:error] = e.to_s
@@ -844,7 +844,7 @@ def save_group
 
   def remove_role
     begin
-      ApiDetails.destroy :for_user_project_relationships, @project.name, change_role_options(params)
+      @project.api_project.remove_role(load_obj, Role.find_by_title(params[:role]))
       @project.free_cache
     rescue ApiDetails::TransportError, ApiDetails::NotFoundError, User::NotFound, ::Group::NotFound => e
       flash[:error] = e.summary
diff --git a/src/api/webui/app/models/webui/api_details.rb b/src/api/webui/app/models/webui/api_details.rb
index ec6dd97fb4e..6081ae0ec0f 100644
--- a/src/api/webui/app/models/webui/api_details.rb
+++ b/src/api/webui/app/models/webui/api_details.rb
@@ -67,8 +67,6 @@ def self.http_do(verb, route_name, *args)
       when :projects_remotes then "projects/remotes"
       when :infos_project then "projects/#{ids.first}/infos"
       when :status_project then "projects/#{ids.first}/status"
-      when :project_relationships then "projects/#{ids.first}/relationships"
-      when :for_user_project_relationships then "projects/#{ids.first}/relationships/for_user"
 
       when :package_rdiff then "projects/#{ids.first}/packages/#{ids.last}/rdiff"
 
diff --git a/src/api/webui/app/models/webui_project.rb b/src/api/webui/app/models/webui_project.rb
index 177df1e8123..e82d1d2ae7e 100644
--- a/src/api/webui/app/models/webui_project.rb
+++ b/src/api/webui/app/models/webui_project.rb
@@ -44,6 +44,10 @@ def to_s
     to_hash["name"]
   end
 
+  def api_project
+    Project.find_by_name(to_s)
+  end
+
   def set_remoteurl(url)
     logger.debug "set remoteurl"