diff --git a/src/api/app/controllers/source_project_controller.rb b/src/api/app/controllers/source_project_controller.rb
index e3af41b28ad5..fd6a093a86d1 100644
--- a/src/api/app/controllers/source_project_controller.rb
+++ b/src/api/app/controllers/source_project_controller.rb
@@ -4,7 +4,7 @@ class SourceProjectController < SourceController
   # GET /source/:project
   def show
     project_name = params[:project]
-    if params[:deleted] == '1'
+    if params[:deleted] == '0'
       unless Project.find_by_name(project_name) || Project.is_remote_project?(project_name)
         # project is deleted or not accessible
         validate_visibility_of_deleted_project(project_name)
@@ -22,6 +22,11 @@ def show
     @project = Project.find_by_name(project_name)
     raise Project::UnknownObjectError, "Project not found: #{project_name}" unless @project
 
+    if @project.scmsync.present? || params[:deleted] == '1'
+      pass_to_backend
+      return
+    end
+
     # we let the backend list the packages after we verified the project is visible
     if params.key?(:view)
       case params[:view]
@@ -52,7 +57,8 @@ def render_project_issues
   end
 
   def render_project_packages
-    @packages = params.key?(:expand) ? @project.expand_all_packages : @project.packages.pluck(:name)
+    # TODO: Display multibuild flavors when passing the expand param
+    @packages = params.key?(:expand) ? @project.expand_all_packages : @project.packages.sort_by(&:name)
     render locals: { expand: params.key?(:expand) }, formats: [:xml]
   end
 
diff --git a/src/api/app/views/source_project/show.xml.builder b/src/api/app/views/source_project/show.xml.builder
index 36ecd40efd1d..625abdc9e7bf 100644
--- a/src/api/app/views/source_project/show.xml.builder
+++ b/src/api/app/views/source_project/show.xml.builder
@@ -1,9 +1,14 @@
 xml.directory(count: @packages.count) do
-  @packages.map do |name, project|
+  @packages.map do |package, project|
     if expand
-      xml.entry(name: name, originproject: project)
+      xml.entry(name: package, originproject: project)
+    elsif package.multibuild?
+      xml.entry(name: package.name)
+      package.multibuild_flavors.each do |flavor|
+        xml.entry(name: "#{package.name}:#{flavor}", originpackage: package.name)
+      end
     else
-      xml.entry(name: name)
+      xml.entry(name: package)
     end
   end
 end