Add source rule class inside super class

ee/lib/ee/api/entities/merge_request_approval_rule.rb

@@ -4,6 +4,10 @@ module EE
   module API
     module Entities
       class MergeRequestApprovalRule < ApprovalRule
+        class SourceRule < Grape::Entity
+          expose :approvals_required
+        end
+
         expose :source_rule, using: MergeRequestApprovalRule::SourceRule
       end
     end

ee/lib/ee/api/entities/merge_request_approval_rule/source_rule.rb

-# frozen_string_literal: true
-
-module EE
-  module API
-    module Entities
-      class MergeRequestApprovalRule < ApprovalRule
-        class SourceRule < Grape::Entity
-          expose :approvals_required
-        end
-      end
-    end
-  end
-end